diff --git a/libs/image/kis_keyframe_channel.cpp b/libs/image/kis_keyframe_channel.cpp
index 388df1a0cc..fb81f87c9a 100644
--- a/libs/image/kis_keyframe_channel.cpp
+++ b/libs/image/kis_keyframe_channel.cpp
@@ -1,1061 +1,1156 @@
 /*
  *  Copyright (c) 2015 Jouni Pentikäinen <joupent@gmail.com>
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
  *  the Free Software Foundation; either version 2 of the License, or
  *  (at your option) any later version.
  *
  *  This program is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *  GNU General Public License for more details.
  *
  *  You should have received a copy of the GNU General Public License
  *  along with this program; if not, write to the Free Software
  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  */
 
 #include "kis_keyframe_channel.h"
 #include "KoID.h"
 #include "kis_global.h"
 #include "kis_node.h"
 #include "KisCollectionUtils.h"
 #include "kis_time_range.h"
 #include "kundo2command.h"
 #include "kis_keyframe_commands.h"
 #include "kis_animation_cycle.h"
 
 #include <QMap>
 
 const KoID KisKeyframeChannel::Content = KoID("content", ki18n("Content"));
 const KoID KisKeyframeChannel::Opacity = KoID("opacity", ki18n("Opacity"));
 const KoID KisKeyframeChannel::TransformArguments = KoID("transform_arguments", ki18n("Transform"));
 const KoID KisKeyframeChannel::TransformPositionX = KoID("transform_pos_x", ki18n("Position (X)"));
 const KoID KisKeyframeChannel::TransformPositionY = KoID("transform_pos_y", ki18n("Position (Y)"));
 const KoID KisKeyframeChannel::TransformScaleX = KoID("transform_scale_x", ki18n("Scale (X)"));
 const KoID KisKeyframeChannel::TransformScaleY = KoID("transform_scale_y", ki18n("Scale (Y)"));
 const KoID KisKeyframeChannel::TransformShearX = KoID("transform_shear_x", ki18n("Shear (X)"));
 const KoID KisKeyframeChannel::TransformShearY = KoID("transform_shear_y", ki18n("Shear (Y)"));
 const KoID KisKeyframeChannel::TransformRotationX = KoID("transform_rotation_x", ki18n("Rotation (X)"));
 const KoID KisKeyframeChannel::TransformRotationY = KoID("transform_rotation_y", ki18n("Rotation (Y)"));
 const KoID KisKeyframeChannel::TransformRotationZ = KoID("transform_rotation_z", ki18n("Rotation (Z)"));
 
 /**
  * Finds the last item the in the map with a key less than the given one.
  * Returns map.constEnd() if no such key exists.
  */
 template<class T>
 typename QMap<int, T>::const_iterator findActive(const QMap<int, T> &map, int maximumKey)
 {
     typename QMap<int, T>::const_iterator i = map.upperBound(maximumKey);
     if (i == map.constBegin()) return map.constEnd();
     return i - 1;
 }
 
 /**
  * Finds the last item the in the map before the "active" item (see findActive) for the given key.
  * Returns map.constEnd() if no such key exists.
  */
 template<class T>
 typename QMap<int, T>::const_iterator findPrevious(const QMap<int, T> &map, int currentKey)
 {
     typename QMap<int, T>::const_iterator active = lastBeforeOrAt(map, currentKey);
     if (active == map.constEnd()) return map.constEnd();
 
     if (currentKey > active.key()) return active;
 
     if (active == map.constBegin()) return map.constEnd();
     return active - 1;
 }
 
 /**
  * Finds the first item the in the map with a key greater than the given one.
  * Returns map.constEnd() if no such key exists.
  */
 template<class T>
 typename QMap<int, T>::const_iterator findNext(const QMap<int, T> &map, int currentKey)
 {
     return map.upperBound(currentKey);
 }
 
 struct KisKeyframeChannel::Private
 {
     Private() {}
     Private(const Private &rhs, KisNodeWSP newParentNode) {
         node = newParentNode;
         id = rhs.id;
         defaultBounds = rhs.defaultBounds;
         haveBrokenFrameTimeBug = rhs.haveBrokenFrameTimeBug;
     }
 
     KeyframesMap keys;
     QMap<int, QSharedPointer<KisAnimationCycle>> cycles;
     QMap<int, QSharedPointer<KisRepeatFrame>> repeats;
     KisNodeWSP node;
     KoID id;
     KisDefaultBoundsBaseSP defaultBounds;
     bool haveBrokenFrameTimeBug = false;
 
     void add(KisKeyframeBaseSP item) {
         auto repeat = item.dynamicCast<KisRepeatFrame>();
         if (repeat) {
             repeat->cycle()->addRepeat(repeat);
             repeats.insert(repeat->time(), repeat);
         } else {
             auto keyframe = item.dynamicCast<KisKeyframe>();
             KIS_ASSERT_RECOVER_RETURN(keyframe);
             keys.insert(item->time(), keyframe);
         }
     }
 
     void remove(KisKeyframeBaseSP item) {
         auto repeat = item.dynamicCast<KisRepeatFrame>();
         if (repeat) {
             repeat->cycle()->removeRepeat(repeat);
             repeats.remove(repeat->time());
         } else {
             keys.remove(item->time());
         }
     }
 
     void moveKeyframe(KisKeyframeBaseSP keyframe, int newTime) {
         const QSharedPointer<KisAnimationCycle> cycle = cycles.value(keyframe->time());
 
         remove(keyframe);
         keyframe->setTime(newTime);
         add(keyframe);
 
         if (cycle) {
             KIS_SAFE_ASSERT_RECOVER_NOOP(newTime < cycle->lastSourceKeyframe()->time()); // TODO: make sure this is the case
 
             cycles.remove(cycle->time());
             cycle->setTime(newTime);
             cycles.insert(newTime, cycle);
         }
     }
 
     void addCycle(QSharedPointer<KisAnimationCycle> cycle) {
         cycles.insert(cycle->time(), cycle);
 
         Q_FOREACH(QWeakPointer<KisRepeatFrame> repeatWP, cycle->repeats()) {
             KisKeyframeBaseSP repeat = repeatWP.toStrongRef();
             if (repeat) add(repeat);
         }
     }
 
     void removeCycle(QSharedPointer<KisAnimationCycle> cycle) {
         KIS_SAFE_ASSERT_RECOVER_NOOP(cycle->repeats().isEmpty());
         cycles.remove(cycle->time());
     }
 };
 
 KisKeyframeChannel::KisKeyframeChannel(const KoID &id, KisDefaultBoundsBaseSP defaultBounds)
     : m_d(new Private)
 {
     m_d->id = id;
     m_d->node = 0;
     m_d->defaultBounds = defaultBounds;
 }
 
 KisKeyframeChannel::KisKeyframeChannel(const KisKeyframeChannel &rhs, KisNode *newParentNode)
     : m_d(new Private(*rhs.m_d, newParentNode))
 {
     KIS_ASSERT_RECOVER_NOOP(&rhs != this);
 
     Q_FOREACH(KisKeyframeSP keyframe, rhs.m_d->keys) {
         const KisKeyframeSP clone = keyframe->cloneFor(this);
             m_d->add(clone);
     }
 
     Q_FOREACH(const QSharedPointer<KisAnimationCycle> rhsCycle, rhs.m_d->cycles) {
         KisKeyframeSP firstFrame = keyframeAt(rhsCycle->firstSourceKeyframe()->time());
         KisKeyframeSP lastFrame = keyframeAt(rhsCycle->lastSourceKeyframe()->time());
 
         QSharedPointer<KisAnimationCycle> cycle = toQShared(new KisAnimationCycle(this, firstFrame, lastFrame));
         m_d->addCycle(cycle);
 
         Q_FOREACH(auto rhsRepeatWP, rhsCycle->repeats()) {
             const QSharedPointer<KisRepeatFrame> rhsRepeat = rhsRepeatWP.toStrongRef();
             if (rhsRepeat) {
                 m_d->add(toQShared(new KisRepeatFrame(this, rhsRepeat->time(), cycle)));
             }
         }
 
     }
 }
 
 KisKeyframeChannel::~KisKeyframeChannel()
 {}
 
 QString KisKeyframeChannel::id() const
 {
     return m_d->id.id();
 }
 
 QString KisKeyframeChannel::name() const
 {
     return m_d->id.name();
 }
 
 void KisKeyframeChannel::setNode(KisNodeWSP node)
 {
     m_d->node = node;
 }
 
 KisNodeWSP KisKeyframeChannel::node() const
 {
     return m_d->node;
 }
 
 int KisKeyframeChannel::keyframeCount() const
 {
     return m_d->keys.count();
 }
 
 KisKeyframeChannel::KeyframesMap& KisKeyframeChannel::keys()
 {
     return m_d->keys;
 }
 
 const KisKeyframeChannel::KeyframesMap& KisKeyframeChannel::constKeys() const
 {
     return m_d->keys;
 }
 
 #define LAZY_INITIALIZE_PARENT_COMMAND(cmd)       \
     QScopedPointer<KUndo2Command> __tempCommand;  \
     if (!parentCommand) {                         \
         __tempCommand.reset(new KUndo2Command()); \
         cmd = __tempCommand.data();               \
     }
 
 KisKeyframeSP KisKeyframeChannel::addKeyframe(int time, KUndo2Command *parentCommand)
 {
     LAZY_INITIALIZE_PARENT_COMMAND(parentCommand);
     return insertKeyframe(time, KisKeyframeSP(), parentCommand);
 }
 
 KisKeyframeBaseSP KisKeyframeChannel::copyItem(const KisKeyframeBaseSP item, int newTime, KUndo2Command *parentCommand)
 {
     LAZY_INITIALIZE_PARENT_COMMAND(parentCommand);
     return insertKeyframe(newTime, item, parentCommand);
 }
 
 KisKeyframeSP KisKeyframeChannel::copyAsKeyframe(const KisKeyframeBaseSP item, int originalTime, int newTime, KUndo2Command *parentCommand)
 {
     LAZY_INITIALIZE_PARENT_COMMAND(parentCommand);
 
     KisKeyframeSP keyframe = item->getOriginalKeyframeFor(originalTime);
     return insertKeyframe(newTime, keyframe, parentCommand);
 }
 
 KisKeyframeSP KisKeyframeChannel::linkKeyframe(const KisKeyframeBaseSP, int, KUndo2Command*) {
     return KisKeyframeSP();
 }
 
 KisKeyframeSP KisKeyframeChannel::insertKeyframe(int time, const KisKeyframeBaseSP copySrc, KUndo2Command *parentCommand)
 {
     KisKeyframeBaseSP oldItem = itemAt(time);
     if (oldItem) {
         deleteKeyframeImpl(oldItem, parentCommand, false);
     }
 
     Q_ASSERT(parentCommand);
     KisKeyframeSP sourceKeyframe = copySrc ? copySrc->getOriginalKeyframeFor(copySrc->time()) : KisKeyframeSP();
     KisKeyframeSP keyframe = createKeyframe(time, sourceKeyframe, parentCommand);
 
     KUndo2Command *cmd = new KisReplaceKeyframeCommand(this, keyframe->time(), keyframe, parentCommand);
     cmd->redo();
 
     return keyframe;
 }
 
 bool KisKeyframeChannel::deleteKeyframe(KisKeyframeBaseSP keyframe, KUndo2Command *parentCommand)
 {
     return deleteKeyframeImpl(keyframe, parentCommand, true);
 }
 
 bool KisKeyframeChannel::moveKeyframe(KisKeyframeBaseSP keyframe, int newTime, KUndo2Command *parentCommand)
 {
     LAZY_INITIALIZE_PARENT_COMMAND(parentCommand);
 
     if (newTime == keyframe->time()) return false;
 
     KisKeyframeBaseSP other = itemAt(newTime);
     if (other) {
         deleteKeyframeImpl(other, parentCommand, false);
     }
 
     const int srcTime = keyframe->time();
 
     KUndo2Command *cmd = new KisMoveFrameCommand(this, keyframe, srcTime, newTime, parentCommand);
     cmd->redo();
 
     if (srcTime == 0) {
         addKeyframe(srcTime, parentCommand);
     }
 
     return true;
 }
 
 bool KisKeyframeChannel::swapFrames(int lhsTime, int rhsTime, KUndo2Command *parentCommand)
 {
     LAZY_INITIALIZE_PARENT_COMMAND(parentCommand);
 
     if (lhsTime == rhsTime) return false;
 
     KisKeyframeBaseSP lhsFrame = itemAt(lhsTime);
     KisKeyframeBaseSP rhsFrame = itemAt(rhsTime);
 
     if (!lhsFrame && !rhsFrame) return false;
 
     if (lhsFrame && !rhsFrame) {
         moveKeyframe(lhsFrame, rhsTime, parentCommand);
     } else if (!lhsFrame && rhsFrame) {
         moveKeyframe(rhsFrame, lhsTime, parentCommand);
     } else {
         KUndo2Command *cmd = new KisSwapFramesCommand(this, lhsFrame, rhsFrame, parentCommand);
         cmd->redo();
     }
 
     return true;
 }
 
 bool KisKeyframeChannel::deleteKeyframeImpl(KisKeyframeBaseSP item, KUndo2Command *parentCommand, bool recreate)
 {
     LAZY_INITIALIZE_PARENT_COMMAND(parentCommand);
 
     Q_ASSERT(parentCommand);
 
     KUndo2Command *cmd = new KisReplaceKeyframeCommand(this, item->time(), KisKeyframeSP(), parentCommand);
     cmd->redo();
 
     KisKeyframeSP keyframe = item.dynamicCast<KisKeyframe>();
     if (keyframe) {
         destroyKeyframe(keyframe, parentCommand);
 
         if (recreate && keyframe->time() == 0) {
             addKeyframe(0, parentCommand);
         }
     }
 
     return true;
 }
 
 void KisKeyframeChannel::moveKeyframeImpl(KisKeyframeBaseSP keyframe, int newTime)
 {
     KIS_ASSERT_RECOVER_RETURN(keyframe);
     KIS_ASSERT_RECOVER_RETURN(!itemAt(newTime));
 
     KisFrameSet rangeSrc = affectedFrames(keyframe->time());
     QRect rectSrc = keyframe->affectedRect();
 
     emit sigKeyframeAboutToBeMoved(keyframe, newTime);
 
     int oldTime = keyframe->time();
     m_d->moveKeyframe(keyframe, newTime);
     keyframe->setTime(newTime);
 
     emit sigKeyframeMoved(keyframe, oldTime);
 
     KisFrameSet rangeDst = affectedFrames(keyframe->time());
     QRect rectDst = keyframe->affectedRect();
 
     requestUpdate(rangeSrc, rectSrc);
     requestUpdate(rangeDst, rectDst);
 }
 
 void KisKeyframeChannel::swapKeyframesImpl(KisKeyframeBaseSP lhsKeyframe, KisKeyframeBaseSP rhsKeyframe)
 {
     KIS_ASSERT_RECOVER_RETURN(lhsKeyframe);
     KIS_ASSERT_RECOVER_RETURN(rhsKeyframe);
 
     KisFrameSet rangeLhs = affectedFrames(lhsKeyframe->time());
     KisFrameSet rangeRhs = affectedFrames(rhsKeyframe->time());
 
     const QRect rectLhsSrc = lhsKeyframe->affectedRect();
     const QRect rectRhsSrc = rhsKeyframe->affectedRect();
 
     const int lhsTime = lhsKeyframe->time();
     const int rhsTime = rhsKeyframe->time();
 
     emit sigKeyframeAboutToBeMoved(lhsKeyframe, rhsTime);
     emit sigKeyframeAboutToBeMoved(rhsKeyframe, lhsTime);
 
     m_d->remove(lhsKeyframe);
     m_d->remove(rhsKeyframe);
 
     rhsKeyframe->setTime(lhsTime);
     lhsKeyframe->setTime(rhsTime);
 
     m_d->add(lhsKeyframe);
     m_d->add(rhsKeyframe);
 
     emit sigKeyframeMoved(lhsKeyframe, lhsTime);
     emit sigKeyframeMoved(rhsKeyframe, rhsTime);
 
     const QRect rectLhsDst = lhsKeyframe->affectedRect();
     const QRect rectRhsDst = rhsKeyframe->affectedRect();
 
     requestUpdate(rangeLhs, rectLhsSrc | rectRhsDst);
     requestUpdate(rangeRhs, rectRhsSrc | rectLhsDst);
 }
 
 KisKeyframeBaseSP KisKeyframeChannel::replaceKeyframeAt(int time, KisKeyframeBaseSP newKeyframe)
 {
     Q_ASSERT(newKeyframe.isNull() || time == newKeyframe->time());
 
     KisKeyframeBaseSP existingKeyframe = itemAt(time);
     if (!existingKeyframe.isNull()) {
         removeKeyframeLogical(existingKeyframe);
     }
 
     if (!newKeyframe.isNull()) {
         insertKeyframeLogical(newKeyframe);
     }
 
     return existingKeyframe;
 }
 
 void KisKeyframeChannel::insertKeyframeLogical(KisKeyframeBaseSP keyframe)
 {
     const int time = keyframe->time();
 
     emit sigKeyframeAboutToBeAdded(keyframe);
     m_d->add(keyframe);
     emit sigKeyframeAdded(keyframe);
 
     QRect rect = keyframe->affectedRect();
     KisFrameSet range = affectedFrames(time);
     requestUpdate(range, rect);
 }
 
 void KisKeyframeChannel::removeKeyframeLogical(KisKeyframeBaseSP keyframe)
 {
     QRect rect = keyframe->affectedRect();
     KisFrameSet range = affectedFrames(keyframe->time());
 
     emit sigKeyframeAboutToBeRemoved(keyframe);
     m_d->remove(keyframe);
     emit sigKeyframeRemoved(keyframe);
 
     requestUpdate(range, rect);
 }
 
 KisKeyframeSP KisKeyframeChannel::keyframeAt(int time) const
 {
     return m_d->keys.value(time);
 }
 
 KisKeyframeSP KisKeyframeChannel::activeKeyframeAt(int time) const
 {
     KeyframesMap::const_iterator i = KisCollectionUtils::lastBeforeOrAt(m_d->keys, time);
     if (i != m_d->keys.constEnd()) {
         return i.value();
     }
 
     return KisKeyframeSP();
 }
 
 KisKeyframeSP KisKeyframeChannel::visibleKeyframeAt(int time) const
 {
     const QSharedPointer<KisRepeatFrame> repeat = activeRepeatAt(time);
     return repeat ? repeat->getOriginalKeyframeFor(time) : activeKeyframeAt(time);
 }
 
 KisKeyframeSP KisKeyframeChannel::currentlyActiveKeyframe() const
 {
     return activeKeyframeAt(currentTime());
 }
 
 KisKeyframeSP KisKeyframeChannel::firstKeyframe() const
 {
     if (m_d->keys.isEmpty()) return KisKeyframeSP();
     return m_d->keys.first();
 }
 
 KisKeyframeSP KisKeyframeChannel::nextKeyframe(KisKeyframeSP keyframe) const
 {
     return nextKeyframe(keyframe->time());
 }
 
 KisKeyframeSP KisKeyframeChannel::nextKeyframe(int time) const
 {
     KeyframesMap::const_iterator i = KisCollectionUtils::firstAfter(m_d->keys, time);
     if (i == m_d->keys.constEnd()) return KisKeyframeSP(0);
     return i.value();
 }
 
 KisKeyframeSP KisKeyframeChannel::previousKeyframe(KisKeyframeSP keyframe) const
 {
     return previousKeyframe(keyframe->time());
 }
 
 KisKeyframeSP KisKeyframeChannel::previousKeyframe(int time) const
 {
     KeyframesMap::const_iterator i = KisCollectionUtils::lastBefore(m_d->keys, time);
     if (i == m_d->keys.constEnd()) return KisKeyframeSP(0);
     return i.value();
 }
 
 KisKeyframeSP KisKeyframeChannel::lastKeyframe() const
 {
     if (m_d->keys.isEmpty()) return KisKeyframeSP(0);
 
     return (m_d->keys.end()-1).value();
 }
 
 KisKeyframeBaseSP KisKeyframeChannel::itemAt(int time) const
 {
     const KisKeyframeSP keyframe = keyframeAt(time);
     if (keyframe) return keyframe;
 
     const QSharedPointer<KisRepeatFrame> repeat = activeRepeatAt(time);
     if (repeat && time == repeat->time()) return repeat;
 
     return KisKeyframeBaseSP();
 }
 
 KisKeyframeBaseSP KisKeyframeChannel::activeItemAt(int time) const
 {
     const KisKeyframeSP keyframe = activeKeyframeAt(time);
     if (keyframe) return keyframe;
 
     return activeRepeatAt(time);
 }
 
 KisKeyframeBaseSP KisKeyframeChannel::nextItem(const KisKeyframeBase &item) const
 {
     const KisKeyframeSP keyframe = nextKeyframe(item.time());
 
     auto repeatIter = KisCollectionUtils::firstAfter(m_d->repeats, item.time());
     const auto repeat = (repeatIter != m_d->repeats.constEnd()) ? repeatIter.value() : QSharedPointer<KisRepeatFrame>();
 
     if (keyframe && (!repeat || repeat->time() > keyframe->time())) return keyframe;
 
     return repeat;
 }
 
 KisKeyframeBaseSP KisKeyframeChannel::previousItem(const KisKeyframeBase &item) const
 {
     const KisKeyframeSP keyframe = previousKeyframe(item.time());
 
     auto repeatIter = KisCollectionUtils::lastBefore(m_d->repeats, item.time());
     const auto repeat = (repeatIter != m_d->repeats.constEnd()) ? repeatIter.value() : QSharedPointer<KisRepeatFrame>();
     if (keyframe && (!repeat || repeat->time() > keyframe->time())) return keyframe;
 
     return repeat;
 }
 
+KisRangedKeyframeIterator KisKeyframeChannel::itemsWithin(KisTimeSpan range) const
+{
+    return KisRangedKeyframeIterator(this, range);
+}
+
 KisVisibleKeyframeIterator KisKeyframeChannel::visibleKeyframesFrom(int time) const
 {
     return KisVisibleKeyframeIterator(visibleKeyframeAt(time));
 }
 
 QList<QSharedPointer<KisAnimationCycle>> KisKeyframeChannel::cycles() const
 {
     return m_d->cycles.values();
 }
 
 KisTimeSpan KisKeyframeChannel::cycledRangeAt(int time) const
 {
     QSharedPointer<KisRepeatFrame> repeat = activeRepeatAt(time);
     if (repeat) return repeat->cycle()->originalRange();
 
     QSharedPointer<KisAnimationCycle> cycle = cycleAt(time);
     if (cycle) return cycle->originalRange();
 
     return KisTimeSpan();
 }
 
 QSharedPointer<KisAnimationCycle> KisKeyframeChannel::cycleAt(int time) const
 {
     if (m_d->cycles.isEmpty()) return QSharedPointer<KisAnimationCycle>();
 
     const auto it = KisCollectionUtils::lastBeforeOrAt(m_d->cycles, time);
     if (it == m_d->cycles.constEnd()) return QSharedPointer<KisAnimationCycle>();
 
     const KisKeyframeBaseSP next = nextItem(*it.value()->lastSourceKeyframe());
     if (next && next->time() <= time) return QSharedPointer<KisAnimationCycle>();
 
     return it.value();
 };
 
 QSharedPointer<KisRepeatFrame> KisKeyframeChannel::activeRepeatAt(int time) const
 {
     const auto repeat = KisCollectionUtils::lastBeforeOrAt(m_d->repeats, time);
     if (repeat == m_d->repeats.constEnd()) return QSharedPointer<KisRepeatFrame>();
 
     const KisKeyframeSP lastKeyframe = activeKeyframeAt(time);
     if (lastKeyframe && lastKeyframe->time() > repeat.value()->time()) return QSharedPointer<KisRepeatFrame>();
 
     return repeat.value();
 }
 
 void KisKeyframeChannel::activeKeyframeRange(int time, int *first, int *last) const
 {
     *first = *last = -1;
 
     const KisKeyframeSP currentKeyframe = activeKeyframeAt(time);
     if (currentKeyframe.isNull()) return;
 
     *first = currentKeyframe->time();
 
     const KisKeyframeSP next = nextKeyframe(currentKeyframe);
     if (!next.isNull()) {
         *last = next->time() - 1;
     }
 }
 
 int KisKeyframeChannel::framesHash() const
 {
     KeyframesMap::const_iterator it = m_d->keys.constBegin();
     KeyframesMap::const_iterator end = m_d->keys.constEnd();
 
     int hash = 0;
 
     while (it != end) {
         hash += it.key();
         ++it;
     }
 
     return hash;
 }
 
 QSet<int> KisKeyframeChannel::allKeyframeIds() const
 {
     QSet<int> frames;
 
     KeyframesMap::const_iterator it = m_d->keys.constBegin();
     KeyframesMap::const_iterator end = m_d->keys.constEnd();
 
     while (it != end) {
         frames.insert(it.key());
         ++it;
     }
 
     return frames;
 }
 
 KisFrameSet KisKeyframeChannel::affectedFrames(int time) const
 {
     if (m_d->keys.isEmpty()) return KisFrameSet::infiniteFrom(0);
 
     KeyframesMap::const_iterator active = KisCollectionUtils::lastBeforeOrAt(m_d->keys, time);
     KeyframesMap::const_iterator next;
 
     int from;
 
     if (active == m_d->keys.constEnd()) {
         // No active keyframe, ie. time is before the first keyframe
         from = 0;
         next = m_d->keys.constBegin();
     } else {
         from = active.key();
         next = active + 1;
     }
 
     KisFrameSet frames;
 
     QSharedPointer<KisRepeatFrame> repeat = activeRepeatAt(time);
 
     if (repeat) {
         const KisKeyframeSP original = repeat->getOriginalKeyframeFor(time);
         return affectedFrames(original->time());
     }
 
     QSharedPointer<KisAnimationCycle> cycle = cycleAt(time);
     if (cycle) {
         KIS_SAFE_ASSERT_RECOVER_RETURN_VALUE(active != m_d->keys.constEnd() && active.value(), KisFrameSet());
         frames = cycle->instancesWithin(active.value(), KisTimeSpan());
     }
 
     if (next == m_d->keys.constEnd()) {
         frames |= KisFrameSet::infiniteFrom(from);
     } else {
         frames |= KisFrameSet::between(from, next.key() - 1);
     }
 
     return frames;
 }
 
 KisFrameSet KisKeyframeChannel::identicalFrames(int time, const KisTimeSpan range) const
 {
     const QSharedPointer<KisRepeatFrame> repeat = activeRepeatAt(time);
     if (repeat) {
         const KisKeyframeSP original = repeat->getOriginalKeyframeFor(time);
         return identicalFrames(original->time(), range);
     }
 
     KeyframesMap::const_iterator active = KisCollectionUtils::lastBeforeOrAt(m_d->keys, time);
 
     const QSharedPointer<KisAnimationCycle> cycle = cycleAt(time);
     if (cycle) {
         return cycle->instancesWithin(active.value(), range);
     }
 
     if (active != m_d->keys.constEnd() && (active+1) != m_d->keys.constEnd()) {
         if (active->data()->interpolationMode() != KisKeyframe::Constant) {
             return KisFrameSet::between(time, time);
         }
     }
 
     return affectedFrames(time);
 }
 
 bool KisKeyframeChannel::areFramesIdentical(int time1, int time2) const
 {
     const KisFrameSet identical = identicalFrames(time1, KisTimeSpan(time2, time2));
     return identical.contains(time2);
 }
 
 bool KisKeyframeChannel::isFrameAffectedBy(int targetFrame, int changedFrame) const
 {
     const KisFrameSet affected = affectedFrames(changedFrame);
     return affected.contains(targetFrame);
 }
 
 QDomElement KisKeyframeChannel::toXML(QDomDocument doc, const QString &layerFilename)
 {
     QDomElement channelElement = doc.createElement("channel");
 
     channelElement.setAttribute("name", id());
 
     Q_FOREACH (KisKeyframeSP keyframe, m_d->keys.values()) {
         QDomElement keyframeElement = doc.createElement("keyframe");
         keyframeElement.setAttribute("time", keyframe->time());
         keyframeElement.setAttribute("color-label", keyframe->colorLabel());
 
         saveKeyframe(keyframe, keyframeElement, layerFilename);
 
         channelElement.appendChild(keyframeElement);
     }
 
     Q_FOREACH (const QSharedPointer<KisAnimationCycle> cycle, m_d->cycles.values()) {
         QDomElement cycleElement = doc.createElement("cycle");
         cycleElement.setAttribute("firstKeyframe", cycle->firstSourceKeyframe()->time());
         cycleElement.setAttribute("lastKeyframe", cycle->lastSourceKeyframe()->time());
 
         Q_FOREACH (auto repeatWP, cycle->repeats()) {
             const QSharedPointer<KisRepeatFrame> repeat = repeatWP.toStrongRef();
             if (!repeat) continue;
 
             QDomElement repeatElement = doc.createElement("repeat");
             repeatElement.setAttribute("time", repeat->time());
             cycleElement.appendChild(repeatElement);
         }
 
         channelElement.appendChild(cycleElement);
     }
 
     return channelElement;
 }
 
 void KisKeyframeChannel::loadXML(const QDomElement &channelNode)
 {
     for (QDomElement childNode = channelNode.firstChildElement(); !childNode.isNull(); childNode = childNode.nextSiblingElement()) {
         const QString nodeName = childNode.nodeName().toUpper();
         if (nodeName == "KEYFRAME") {
             const QString keyframeType = childNode.attribute("type", "").toUpper();
 
             KisKeyframeSP keyframe;
             keyframe = loadKeyframe(childNode);
 
             KIS_SAFE_ASSERT_RECOVER(keyframe) { continue; }
 
             if (childNode.hasAttribute("color-label")) {
                 keyframe->setColorLabel(childNode.attribute("color-label").toUInt());
             }
 
             m_d->add(keyframe);
         }
     }
 
     for (QDomElement childNode = channelNode.firstChildElement(); !childNode.isNull(); childNode = childNode.nextSiblingElement()) {
         if (childNode.nodeName().toUpper() == "CYCLE") {
             QSharedPointer<KisAnimationCycle> cycle = loadCycle(childNode);
             if (cycle) {
                 m_d->addCycle(cycle);
             }
         }
     }
 }
 
 QSharedPointer<KisAnimationCycle> KisKeyframeChannel::loadCycle(const QDomElement &cycleElement)
 {
     const int firstKeyframeTime = cycleElement.attribute("firstKeyframe", "-1").toInt();
     const int lastKeyframeTime = cycleElement.attribute("lastKeyframe", "-1").toInt();
 
     if (firstKeyframeTime < 0 || lastKeyframeTime <= firstKeyframeTime) {
         qWarning() << "Invalid cycle range: " << firstKeyframeTime << "to" << lastKeyframeTime;
         return nullptr;
     }
 
     const KisKeyframeSP firstKeyframe = keyframeAt(firstKeyframeTime);
     const KisKeyframeSP lastKeyframe = keyframeAt(lastKeyframeTime);
 
     if (!firstKeyframe || !lastKeyframe) {
         qWarning() << "Could not find defining keyframes for cycle " << firstKeyframeTime << "to" << lastKeyframeTime;
         return nullptr;
     }
 
     QSharedPointer<KisAnimationCycle> cycle = toQShared(new KisAnimationCycle(this, firstKeyframe, lastKeyframe));
 
     for (QDomElement grandChildNode = cycleElement.firstChildElement(); !grandChildNode.isNull(); grandChildNode = grandChildNode.nextSiblingElement()) {
         if (grandChildNode.nodeName().toUpper() == "REPEAT") {
             const int time = grandChildNode.attribute("time").toInt();
             const QSharedPointer<KisRepeatFrame> repeat = toQShared(new KisRepeatFrame(this, time, cycle));
             m_d->add(repeat);
         }
     }
 
     return cycle;
 }
 
 bool KisKeyframeChannel::swapExternalKeyframe(KisKeyframeChannel *srcChannel, int srcTime, int dstTime, KUndo2Command *parentCommand)
 {
     if (srcChannel->id() != id()) {
         warnKrita << "Cannot copy frames from different ids:" << ppVar(srcChannel->id()) << ppVar(id());
         return KisKeyframeSP();
     }
 
     LAZY_INITIALIZE_PARENT_COMMAND(parentCommand);
 
     KisKeyframeSP srcFrame = srcChannel->keyframeAt(srcTime);
     KisKeyframeSP dstFrame = keyframeAt(dstTime);
 
     if (!dstFrame && srcFrame) {
         copyExternalKeyframe(srcChannel, srcTime, dstTime, parentCommand);
         srcChannel->deleteKeyframe(srcFrame, parentCommand);
     } else if (dstFrame && !srcFrame) {
         srcChannel->copyExternalKeyframe(this, dstTime, srcTime, parentCommand);
         deleteKeyframe(dstFrame, parentCommand);
     } else if (dstFrame && srcFrame) {
         const int fakeFrameTime = -1;
 
         KisKeyframeSP newKeyframe = createKeyframe(fakeFrameTime, KisKeyframeSP(), parentCommand);
         uploadExternalKeyframe(srcChannel, srcTime, newKeyframe);
 
         srcChannel->copyExternalKeyframe(this, dstTime, srcTime, parentCommand);
 
         // do not recreate frame!
         deleteKeyframeImpl(dstFrame, parentCommand, false);
 
         newKeyframe->setTime(dstTime);
 
         KUndo2Command *cmd = new KisReplaceKeyframeCommand(this, newKeyframe->time(), newKeyframe, parentCommand);
         cmd->redo();
     }
 
     return true;
 }
 
 
 KisKeyframeSP KisKeyframeChannel::copyExternalKeyframe(KisKeyframeChannel *srcChannel, int srcTime, int dstTime, KUndo2Command *parentCommand)
 {
     if (srcChannel->id() != id()) {
         warnKrita << "Cannot copy frames from different ids:" << ppVar(srcChannel->id()) << ppVar(id());
         return KisKeyframeSP();
     }
 
     LAZY_INITIALIZE_PARENT_COMMAND(parentCommand);
 
     KisKeyframeSP dstFrame = keyframeAt(dstTime);
     if (dstFrame) {
         deleteKeyframeImpl(dstFrame, parentCommand, false);
     }
 
     KisKeyframeSP newKeyframe = createKeyframe(dstTime, KisKeyframeSP(), parentCommand);
     uploadExternalKeyframe(srcChannel, srcTime, newKeyframe);
 
     KUndo2Command *cmd = new KisReplaceKeyframeCommand(this, newKeyframe->time(), newKeyframe, parentCommand);
     cmd->redo();
 
     return newKeyframe;
 }
 
 KisDefineCycleCommand * KisKeyframeChannel::createCycle(KisKeyframeSP firstKeyframe, KisKeyframeSP lastKeyframe, KUndo2Command *parentCommand)
 {
     const QSharedPointer<KisAnimationCycle> cycle = toQShared(new KisAnimationCycle(this, firstKeyframe, lastKeyframe));
     return new KisDefineCycleCommand(nullptr, cycle, parentCommand);
 }
 
 void KisKeyframeChannel::addCycle(QSharedPointer<KisAnimationCycle> cycle)
 {
     m_d->addCycle(cycle);
 }
 
 KUndo2Command* KisKeyframeChannel::deleteCycle(QSharedPointer<KisAnimationCycle> cycle, KUndo2Command *parentCommand)
 {
     KisDefineCycleCommand *defineCycleCommand = new KisDefineCycleCommand(cycle, nullptr, parentCommand);
 
     // Remove repeats of the cycle
     Q_FOREACH(QWeakPointer<KisRepeatFrame> repeatWP, cycle->repeats()) {
         auto repeat = repeatWP.toStrongRef();
         if (repeat) {
             deleteKeyframe(repeat);
         }
     }
 
     return defineCycleCommand;
 }
 
 void KisKeyframeChannel::removeCycle(QSharedPointer<KisAnimationCycle> cycle)
 {
     m_d->removeCycle(cycle);
 }
 
 QSharedPointer<KisRepeatFrame> KisKeyframeChannel::addRepeat(QSharedPointer<KisAnimationCycle> cycle, int time, KUndo2Command *parentCommand)
 {
     const QSharedPointer<KisRepeatFrame> repeatFrame = toQShared(new KisRepeatFrame(this, time, cycle));
     KUndo2Command *cmd = new KisReplaceKeyframeCommand(this, time, repeatFrame, parentCommand);
     cmd->redo();
 
     return repeatFrame;
 }
 
 void KisKeyframeChannel::requestUpdate(const KisFrameSet &range, const QRect &rect)
 {
     if (m_d->node) {
         m_d->node->invalidateFrames(range, rect);
 
         int currentTime = m_d->defaultBounds->currentTime();
         if (range.contains(currentTime)) {
             m_d->node->setDirty(rect);
         }
     }
 }
 
 void KisKeyframeChannel::workaroundBrokenFrameTimeBug(int *time)
 {
     /**
      * Between Krita 4.1 and 4.4 Krita had a bug which resulted in creating frames
      * with negative time stamp. The bug has been fixed, but there might be some files
      * still in the wild.
      *
      * TODO: remove this workaround in Krita 5.0, when no such file are left :)
      */
 
     if (*time < 0) {
         qWarning() << "WARNING: Loading a file with negative animation frames!";
         qWarning() << "         The file has been saved with a buggy version of Krita.";
         qWarning() << "         All the frames with negative ids will be dropped!";
         qWarning() << "         " << ppVar(this->id()) << ppVar(*time);
 
         m_d->haveBrokenFrameTimeBug = true;
         *time = 0;
     }
 
     if (m_d->haveBrokenFrameTimeBug) {
         while (keyframeAt(*time)) {
             (*time)++;
         }
     }
 }
 
 int KisKeyframeChannel::currentTime() const
 {
     return m_d->defaultBounds->currentTime();
 }
 
 qreal KisKeyframeChannel::minScalarValue() const
 {
     return 0;
 }
 
 qreal KisKeyframeChannel::maxScalarValue() const
 {
     return 0;
 }
 
 qreal KisKeyframeChannel::scalarValue(const KisKeyframeSP keyframe) const
 {
     Q_UNUSED(keyframe);
 
     return 0;
 }
 
 void KisKeyframeChannel::setScalarValue(KisKeyframeSP keyframe, qreal value, KUndo2Command *parentCommand)
 {
     Q_UNUSED(keyframe);
     Q_UNUSED(value);
     Q_UNUSED(parentCommand);
 }
 
+KisKeyframeBaseSP firstKeyframeInRange(const KisKeyframeChannel *channel, KisTimeSpan range)
+{
+    KisKeyframeBaseSP active = channel->activeItemAt(range.start());
+
+    if (active) {
+        if (range.contains(active->time())) return active;
+        if (active->time() < range.start()) {
+            const KisKeyframeBaseSP next = channel->nextItem(*active);
+            if (next && range.contains(next->time())) return next;
+        }
+    }
+
+    return KisKeyframeBaseSP();
+}
+
+KisRangedKeyframeIterator::KisRangedKeyframeIterator()
+{}
+
+KisRangedKeyframeIterator::KisRangedKeyframeIterator(const KisKeyframeChannel *channel, KisKeyframeBaseSP keyframe, KisTimeSpan range)
+    : m_channel(channel)
+    , m_keyframe(keyframe)
+    , m_range(range)
+{}
+
+KisRangedKeyframeIterator::KisRangedKeyframeIterator(const KisKeyframeChannel *channel, KisTimeSpan range)
+    : KisRangedKeyframeIterator(channel, firstKeyframeInRange(channel, range), range) {}
+
+KisRangedKeyframeIterator& KisRangedKeyframeIterator::operator++()
+{
+    if (!m_keyframe) return *this;
+
+    m_keyframe = m_channel->nextItem(*m_keyframe);
+    if (!m_keyframe || !m_range.contains(m_keyframe->time())) {
+        m_keyframe = nullptr;
+    }
+
+    return *this;
+}
+
+KisRangedKeyframeIterator& KisRangedKeyframeIterator::operator--()
+{
+    if (!m_keyframe) {
+        // One-past-end state: return to last keyframe in range
+        const KisKeyframeBaseSP last = m_channel->activeItemAt(m_range.end());
+        if (m_range.contains(last->time())) m_keyframe = last;
+    } else {
+        const KisKeyframeBaseSP previousKeyframe = m_channel->previousItem(*m_keyframe);
+        if (previousKeyframe && m_range.contains(previousKeyframe->time())) {
+            m_keyframe = previousKeyframe;
+        }
+    }
+
+    return *this;
+}
+
+KisKeyframeBaseSP KisRangedKeyframeIterator::operator*() const
+{
+    return m_keyframe;
+}
+
+KisKeyframeBaseSP KisRangedKeyframeIterator::operator->() const
+{
+    return m_keyframe;
+}
+
+KisRangedKeyframeIterator KisRangedKeyframeIterator::begin() const
+{
+    return KisRangedKeyframeIterator(m_channel, m_range);
+}
+
+KisRangedKeyframeIterator KisRangedKeyframeIterator::end() const
+{
+    return KisRangedKeyframeIterator(m_channel, nullptr, m_range);
+}
+
+bool KisRangedKeyframeIterator::isValid() const
+{
+    return m_keyframe != nullptr;
+}
+
+bool KisRangedKeyframeIterator::operator==(const KisRangedKeyframeIterator &rhs) const
+{
+    return m_keyframe == rhs.m_keyframe && m_range == rhs.m_range;
+}
+
+bool KisRangedKeyframeIterator::operator!=(const KisRangedKeyframeIterator &rhs) const
+{
+    return !(rhs == *this);
+}
+
 KisVisibleKeyframeIterator::KisVisibleKeyframeIterator() = default;
 
 KisVisibleKeyframeIterator::KisVisibleKeyframeIterator(KisKeyframeSP keyframe)
     : m_channel(keyframe->channel())
     , m_keyframe(keyframe)
     , m_time(keyframe->time())
 {}
 
 KisVisibleKeyframeIterator& KisVisibleKeyframeIterator::operator--()
 {
     const QSharedPointer<KisRepeatFrame> repeat = m_channel->activeRepeatAt(m_time);
 
     if (repeat) {
         const int time = repeat->previousVisibleFrame(m_time);
         if (time >= 0) {
             m_time = time;
             return *this;
         }
     }
 
     m_keyframe = m_channel->previousKeyframe(m_keyframe->time());
     if (!m_keyframe) return invalidate();
 
     m_time = m_keyframe->time();
     return *this;
 }
 
 KisVisibleKeyframeIterator& KisVisibleKeyframeIterator::operator++()
 {
     const QSharedPointer<KisRepeatFrame> repeat = m_channel->activeRepeatAt(m_time);
 
     if (repeat) {
         const int time = repeat->nextVisibleFrame(m_time);
         if (time >= 0) {
             m_time = time;
             return *this;
         }
     }
 
     m_keyframe = m_channel->nextKeyframe(m_keyframe->time());
     if (!m_keyframe) return invalidate();
 
     m_time = m_keyframe->time();
 
     return *this;
 };
 
 KisKeyframeSP KisVisibleKeyframeIterator::operator*() const
 {
     const KisRepeatFrame *repeat = dynamic_cast<KisRepeatFrame*>(m_keyframe.data());
 
     if (repeat) {
         return repeat->getOriginalKeyframeFor(m_time);
     }
 
     return m_keyframe;
 }
 
 KisKeyframeSP KisVisibleKeyframeIterator::operator->() const
 {
     return operator*();
 }
 
 bool KisVisibleKeyframeIterator::isValid() const
 {
     return m_channel && m_time >= 0;
 }
 
 KisVisibleKeyframeIterator& KisVisibleKeyframeIterator::invalidate()
 {
     m_channel = nullptr;
     m_keyframe = KisKeyframeSP();
     m_time = -1;
 
     return *this;
 }
diff --git a/libs/image/kis_keyframe_channel.h b/libs/image/kis_keyframe_channel.h
index 8cdaa4dc1b..238079e770 100644
--- a/libs/image/kis_keyframe_channel.h
+++ b/libs/image/kis_keyframe_channel.h
@@ -1,239 +1,272 @@
 /*
  *  Copyright (c) 2015 Jouni Pentikäinen <joupent@gmail.com>
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License as published by
  *  the Free Software Foundation; either version 2 of the License, or
  *  (at your option) any later version.
  *
  *  This program is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *  GNU General Public License for more details.
  *
  *  You should have received a copy of the GNU General Public License
  *  along with this program; if not, write to the Free Software
  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  */
 
 #ifndef KIS_KEYFRAME_CHANNEL_H
 #define KIS_KEYFRAME_CHANNEL_H
 
 #include <QVariant>
 #include <QDomElement>
 #include <kundo2command.h>
 
 #include "kis_types.h"
 #include "KoID.h"
 #include "kritaimage_export.h"
 #include "kis_keyframe.h"
 #include "kis_default_bounds.h"
+#include "kis_time_range.h"
 
 class KisFrameSet;
 class KisTimeSpan;
 class KisAnimationCycle;
 class KisRepeatFrame;
+class KisRangedKeyframeIterator;
 class KisVisibleKeyframeIterator;
 class KisDefineCycleCommand;
 
 class KRITAIMAGE_EXPORT KisKeyframeChannel : public QObject
 {
     Q_OBJECT
 
 public:
     // Standard Keyframe Ids
 
     static const KoID Content;
     static const KoID Opacity;
     static const KoID TransformArguments;
     static const KoID TransformPositionX;
     static const KoID TransformPositionY;
 
     static const KoID TransformScaleX;
     static const KoID TransformScaleY;
     static const KoID TransformShearX;
     static const KoID TransformShearY;
     static const KoID TransformRotationX;
     static const KoID TransformRotationY;
     static const KoID TransformRotationZ;
 public:
     KisKeyframeChannel(const KoID& id, KisDefaultBoundsBaseSP defaultBounds);
     KisKeyframeChannel(const KisKeyframeChannel &rhs, KisNode *newParentNode);
     ~KisKeyframeChannel() override;
 
     QString id() const;
     QString name() const;
 
     void setNode(KisNodeWSP node);
     KisNodeWSP node() const;
 
     KisKeyframeSP addKeyframe(int time, KUndo2Command *parentCommand = 0);
     bool deleteKeyframe(KisKeyframeBaseSP keyframe, KUndo2Command *parentCommand = 0);
     bool moveKeyframe(KisKeyframeBaseSP keyframe, int newTime, KUndo2Command *parentCommand = 0);
     bool swapFrames(int lhsTime, int rhsTime, KUndo2Command *parentCommand = 0);
     KisKeyframeBaseSP copyItem(const KisKeyframeBaseSP item, int newTime, KUndo2Command *parentCommand = 0);
     KisKeyframeSP copyAsKeyframe(const KisKeyframeBaseSP item, int originalTime, int newTime, KUndo2Command *parentCommand = 0);
     virtual KisKeyframeSP linkKeyframe(const KisKeyframeBaseSP keyframe, int newTime, KUndo2Command *parentCommand = 0);
     KisKeyframeSP copyExternalKeyframe(KisKeyframeChannel *srcChannel, int srcTime, int dstTime, KUndo2Command *parentCommand = 0);
 
     KisDefineCycleCommand * createCycle(KisKeyframeSP firstKeyframe, KisKeyframeSP lastKeyframe, KUndo2Command *parentCommand = 0);
     KUndo2Command * deleteCycle(QSharedPointer<KisAnimationCycle> cycle, KUndo2Command *parentCommand = 0);
     QSharedPointer<KisRepeatFrame> addRepeat(QSharedPointer<KisAnimationCycle> cycle, int time, KUndo2Command *parentCommand);
 
     bool swapExternalKeyframe(KisKeyframeChannel *srcChannel, int srcTime, int dstTime, KUndo2Command *parentCommand = 0);
 
     KisKeyframeSP keyframeAt(int time) const;
     KisKeyframeSP activeKeyframeAt(int time) const;
     KisKeyframeSP visibleKeyframeAt(int time) const;
     KisKeyframeSP currentlyActiveKeyframe() const;
 
     KisKeyframeSP firstKeyframe() const;
     KisKeyframeSP nextKeyframe(KisKeyframeSP keyframe) const;
     KisKeyframeSP previousKeyframe(KisKeyframeSP keyframe) const;
     KisKeyframeSP nextKeyframe(int time) const;
     KisKeyframeSP previousKeyframe(int time) const;
     KisKeyframeSP lastKeyframe() const;
 
     KisKeyframeBaseSP itemAt(int time) const;
     KisKeyframeBaseSP activeItemAt(int time) const;
     KisKeyframeBaseSP nextItem(const KisKeyframeBase &item) const;
     KisKeyframeBaseSP previousItem(const KisKeyframeBase &item) const;
+    KisRangedKeyframeIterator itemsWithin(KisTimeSpan range) const;
 
     KisVisibleKeyframeIterator visibleKeyframesFrom(int time) const;
 
     QList<QSharedPointer<KisAnimationCycle>> cycles() const;
 
     /**
      * Finds the original range of the cycle defined or repeated at the given time.
      * @arg time a time at any frame within the original cycle or any repeat of it.
      */
     KisTimeSpan cycledRangeAt(int time) const;
 
     /**
      * Finds the cycle defined at time, if any.
      * @arg time a time within the original range of the cycle.
      */
     QSharedPointer<KisAnimationCycle> cycleAt(int time) const;
 
     /**
      * Finds the repeat of a cycle at the time, if any.
      */
     QSharedPointer<KisRepeatFrame> activeRepeatAt(int time) const;
 
     /**
      * Finds the span of time of the keyframe active at given time.
      * If there is no active keyframe, first will be -1.
      * If the keyframe continues indefinitely, last will be -1.
      */
     void activeKeyframeRange(int time, int *first, int *last) const;
 
     /**
      * Calculates a pseudo-unique keyframes hash. The hash changes
      * every time any frame is added/removed/moved
      */
     int framesHash() const;
 
     QSet<int> allKeyframeIds() const;
     /**
      * Get the set of frames affected by any changes to the value
      * of the active keyframe at the given time.
      */
     virtual KisFrameSet affectedFrames(int time) const;
 
     /**
      * Get a set of frames for which the channel gives identical
      * results, compared to the given frame.
      *
      * Note: this set may be different than the set of affected frames
      * due to interpolation.
      */
     virtual KisFrameSet identicalFrames(int time, const KisTimeSpan range) const;
     virtual bool areFramesIdentical(int time1, int time2) const;
     virtual bool isFrameAffectedBy(int targetFrame, int changedFrame) const;
 
     int keyframeCount() const;
 
     virtual bool hasScalarValue() const = 0;
     virtual qreal minScalarValue() const;
     virtual qreal maxScalarValue() const;
     virtual qreal scalarValue(const KisKeyframeSP keyframe) const;
     virtual void setScalarValue(KisKeyframeSP keyframe, qreal value, KUndo2Command *parentCommand = 0);
 
     virtual QDomElement toXML(QDomDocument doc, const QString &layerFilename);
     virtual void loadXML(const QDomElement &channelNode);
 
     int currentTime() const;
 
 Q_SIGNALS:
     void sigKeyframeAboutToBeAdded(KisKeyframeBaseSP keyframe);
     void sigKeyframeAdded(KisKeyframeBaseSP keyframe);
     void sigKeyframeAboutToBeRemoved(KisKeyframeBaseSP keyframe);
     void sigKeyframeRemoved(KisKeyframeBaseSP keyframe);
     void sigKeyframeAboutToBeMoved(KisKeyframeBaseSP keyframe, int toTime);
     void sigKeyframeMoved(KisKeyframeBaseSP keyframe, int fromTime);
     void sigKeyframeChanged(KisKeyframeBaseSP keyframe);
 
 protected:
     typedef QMap<int, KisKeyframeSP> KeyframesMap;
 
     KeyframesMap &keys();
     const KeyframesMap &constKeys() const;
 
     virtual KisKeyframeSP createKeyframe(int time, const KisKeyframeSP copySrc, KUndo2Command *parentCommand) = 0;
     virtual void destroyKeyframe(KisKeyframeSP key, KUndo2Command *parentCommand) = 0;
     virtual void uploadExternalKeyframe(KisKeyframeChannel *srcChannel, int srcTime, KisKeyframeSP dstFrame) = 0;
 
     virtual void requestUpdate(const KisFrameSet &range, const QRect &rect);
 
     virtual KisKeyframeSP loadKeyframe(const QDomElement &keyframeNode) = 0;
     virtual void saveKeyframe(KisKeyframeSP keyframe, QDomElement keyframeElement, const QString &layerFilename) = 0;
 
     void workaroundBrokenFrameTimeBug(int *time);
 
 private:
     KisKeyframeBaseSP replaceKeyframeAt(int time, KisKeyframeBaseSP newKeyframe);
     void insertKeyframeLogical(KisKeyframeBaseSP keyframe);
     void removeKeyframeLogical(KisKeyframeBaseSP keyframe);
     bool deleteKeyframeImpl(KisKeyframeBaseSP keyframe, KUndo2Command *parentCommand, bool recreate);
     void moveKeyframeImpl(KisKeyframeBaseSP keyframe, int newTime);
     void swapKeyframesImpl(KisKeyframeBaseSP lhsKeyframe, KisKeyframeBaseSP rhsKeyframe);
 
     void addCycle(QSharedPointer<KisAnimationCycle> cycle);
     void removeCycle(QSharedPointer<KisAnimationCycle> cycle);
 
     friend class KisMoveKeyframesCommand;
     friend class KisMoveFrameCommand;
     friend class KisReplaceKeyframeCommand;
     friend class KisSwapFramesCommand;
     friend class KisDefineCycleCommand;
 
+    friend class KisRangedKeyframeIterator;
+
 private:
     KisKeyframeSP insertKeyframe(int time, const KisKeyframeBaseSP copySrc, KUndo2Command *parentCommand);
     QSharedPointer<KisAnimationCycle> loadCycle(const QDomElement &cycleElement);
 
     struct Private;
     QScopedPointer<Private> m_d;
 };
 
+class KisRangedKeyframeIterator
+{
+public:
+    KisRangedKeyframeIterator();
+    KisRangedKeyframeIterator(const KisKeyframeChannel *channel, KisTimeSpan range);
+
+    KisRangedKeyframeIterator& operator--();
+    KisRangedKeyframeIterator& operator++();
+
+    KisKeyframeBaseSP operator->() const;
+    KisKeyframeBaseSP operator*() const;
+
+    bool operator==(const KisRangedKeyframeIterator &rhs) const;
+    bool operator!=(const KisRangedKeyframeIterator &rhs) const;
+
+    KisRangedKeyframeIterator begin() const;
+    KisRangedKeyframeIterator end() const;
+
+    bool isValid() const;
+
+private:
+    KisRangedKeyframeIterator(const KisKeyframeChannel *channel, KisKeyframeBaseSP keyframe, KisTimeSpan range);
+
+    const KisKeyframeChannel *m_channel{nullptr};
+    KisKeyframeBaseSP m_keyframe;
+    KisTimeSpan m_range;
+};
+
 class KisVisibleKeyframeIterator
 {
 public:
     KisVisibleKeyframeIterator();
     explicit KisVisibleKeyframeIterator(KisKeyframeSP keyframe);
 
     KisVisibleKeyframeIterator& operator--();
     KisVisibleKeyframeIterator& operator++();
 
     bool isValid() const;
     KisKeyframeSP operator->() const;
     KisKeyframeSP operator*() const;
 
 private:
     KisVisibleKeyframeIterator &invalidate();
 
     KisKeyframeChannel *m_channel{nullptr};
     KisKeyframeSP m_keyframe;
     int m_time{-1};
 };
 
 #endif // KIS_KEYFRAME_CHANNEL_H