diff --git a/libs/image/kis_update_scheduler.cpp b/libs/image/kis_update_scheduler.cpp
index 1fc6e373e1..4336c393f0 100644
--- a/libs/image/kis_update_scheduler.cpp
+++ b/libs/image/kis_update_scheduler.cpp
@@ -1,504 +1,509 @@
 /*
  *  Copyright (c) 2010 Dmitry Kazakov <dimula73@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_update_scheduler.h"
 
 #include "klocalizedstring.h"
 #include "kis_image_config.h"
 #include "kis_merge_walker.h"
 #include "kis_full_refresh_walker.h"
 
 #include "kis_updater_context.h"
 #include "kis_simple_update_queue.h"
 #include "kis_strokes_queue.h"
 
 #include "kis_queues_progress_updater.h"
 #include "KisUpdateSchedulerConfigNotifier.h"
 
 #include <QReadWriteLock>
 #include "kis_lazy_wait_condition.h"
 #include <mutex>
 
 //#define DEBUG_BALANCING
 
 #ifdef DEBUG_BALANCING
 #define DEBUG_BALANCING_METRICS(decidedFirst, excl)                     \
     dbgKrita << "Balance decision:" << decidedFirst                     \
     << "(" << excl << ")"                                               \
     << "updates:" << m_d->updatesQueue.sizeMetric()                    \
     << "strokes:" << m_d->strokesQueue.sizeMetric()
 #else
 #define DEBUG_BALANCING_METRICS(decidedFirst, excl)
 #endif
 
 
 struct Q_DECL_HIDDEN KisUpdateScheduler::Private {
     Private(KisUpdateScheduler *_q, KisProjectionUpdateListener *p)
         : q(_q)
         , updaterContext(KisImageConfig().maxNumberOfThreads(), q)
         , projectionUpdateListener(p)
     {}
 
     KisUpdateScheduler *q;
 
     KisSimpleUpdateQueue updatesQueue;
     KisStrokesQueue strokesQueue;
     KisUpdaterContext updaterContext;
     bool processingBlocked = false;
     qreal defaultBalancingRatio = 1.0; // desired strokes-queue-size / updates-queue-size
     KisProjectionUpdateListener *projectionUpdateListener;
     KisQueuesProgressUpdater *progressUpdater = 0;
 
     QAtomicInt updatesLockCounter;
     QReadWriteLock updatesStartLock;
     KisLazyWaitCondition updatesFinishedCondition;
 
     qreal balancingRatio() const {
         const qreal strokeRatioOverride = strokesQueue.balancingRatioOverride();
         return strokeRatioOverride > 0 ? strokeRatioOverride : defaultBalancingRatio;
     }
 };
 
 KisUpdateScheduler::KisUpdateScheduler(KisProjectionUpdateListener *projectionUpdateListener, QObject *parent)
     : QObject(parent),
       m_d(new Private(this, projectionUpdateListener))
 {
     updateSettings();
     connectSignals();
 }
 
 KisUpdateScheduler::KisUpdateScheduler()
     : m_d(new Private(this, 0))
 {
 }
 
 KisUpdateScheduler::~KisUpdateScheduler()
 {
     delete m_d->progressUpdater;
     delete m_d;
 }
 
 void KisUpdateScheduler::setThreadsLimit(int value)
 {
     KIS_SAFE_ASSERT_RECOVER_RETURN(!m_d->processingBlocked);
 
-    barrierLock();
+    /**
+     * Thread limit can be changed without the full-featured barrier
+     * lock, we can avoid waiting for all the jobs to complete. We
+     * should just ensure there is no more jobs in the updater context.
+     */
+    lock();
     m_d->updaterContext.lock();
     m_d->updaterContext.setThreadsLimit(value);
     m_d->updaterContext.unlock();
     unlock(false);
 }
 
 int KisUpdateScheduler::threadsLimit() const
 {
     std::lock_guard<KisUpdaterContext> l(m_d->updaterContext);
     return m_d->updaterContext.threadsLimit();
 }
 
 void KisUpdateScheduler::connectSignals()
 {
     connect(&m_d->updaterContext, SIGNAL(sigContinueUpdate(const QRect&)),
             SLOT(continueUpdate(const QRect&)),
             Qt::DirectConnection);
 
     connect(&m_d->updaterContext, SIGNAL(sigDoSomeUsefulWork()),
             SLOT(doSomeUsefulWork()), Qt::DirectConnection);
 
     connect(&m_d->updaterContext, SIGNAL(sigSpareThreadAppeared()),
             SLOT(spareThreadAppeared()), Qt::DirectConnection);
 
     connect(KisUpdateSchedulerConfigNotifier::instance(), SIGNAL(configChanged()),
             SLOT(updateSettings()));
 }
 
 void KisUpdateScheduler::setProgressProxy(KoProgressProxy *progressProxy)
 {
     delete m_d->progressUpdater;
     m_d->progressUpdater = progressProxy ?
         new KisQueuesProgressUpdater(progressProxy, this) : 0;
 }
 
 void KisUpdateScheduler::progressUpdate()
 {
     if (!m_d->progressUpdater) return;
 
     if(!m_d->strokesQueue.hasOpenedStrokes()) {
         QString jobName = m_d->strokesQueue.currentStrokeName().toString();
         if(jobName.isEmpty()) {
             jobName = i18n("Updating...");
         }
 
         int sizeMetric = m_d->strokesQueue.sizeMetric();
         if (!sizeMetric) {
             sizeMetric = m_d->updatesQueue.sizeMetric();
         }
 
         m_d->progressUpdater->updateProgress(sizeMetric, jobName);
     }
     else {
         m_d->progressUpdater->hide();
     }
 }
 
 void KisUpdateScheduler::updateProjection(KisNodeSP node, const QVector<QRect> &rects, const QRect &cropRect)
 {
     m_d->updatesQueue.addUpdateJob(node, rects, cropRect, currentLevelOfDetail());
     processQueues();
 }
 
 void KisUpdateScheduler::updateProjection(KisNodeSP node, const QRect &rc, const QRect &cropRect)
 {
     m_d->updatesQueue.addUpdateJob(node, rc, cropRect, currentLevelOfDetail());
     processQueues();
 }
 
 void KisUpdateScheduler::updateProjectionNoFilthy(KisNodeSP node, const QRect& rc, const QRect &cropRect)
 {
     m_d->updatesQueue.addUpdateNoFilthyJob(node, rc, cropRect, currentLevelOfDetail());
     processQueues();
 }
 
 void KisUpdateScheduler::fullRefreshAsync(KisNodeSP root, const QRect& rc, const QRect &cropRect)
 {
     m_d->updatesQueue.addFullRefreshJob(root, rc, cropRect, currentLevelOfDetail());
     processQueues();
 }
 
 void KisUpdateScheduler::fullRefresh(KisNodeSP root, const QRect& rc, const QRect &cropRect)
 {
     KisBaseRectsWalkerSP walker = new KisFullRefreshWalker(cropRect);
     walker->collectRects(root, rc);
 
     bool needLock = true;
 
     if(m_d->processingBlocked) {
         warnImage << "WARNING: Calling synchronous fullRefresh under a scheduler lock held";
         warnImage << "We will not assert for now, but please port caller's to strokes";
         warnImage << "to avoid this warning";
         needLock = false;
     }
 
     if(needLock) lock();
     m_d->updaterContext.lock();
 
     Q_ASSERT(m_d->updaterContext.isJobAllowed(walker));
     m_d->updaterContext.addMergeJob(walker);
     m_d->updaterContext.waitForDone();
 
     m_d->updaterContext.unlock();
     if(needLock) unlock(true);
 }
 
 void KisUpdateScheduler::addSpontaneousJob(KisSpontaneousJob *spontaneousJob)
 {
     m_d->updatesQueue.addSpontaneousJob(spontaneousJob);
     processQueues();
 }
 
 KisStrokeId KisUpdateScheduler::startStroke(KisStrokeStrategy *strokeStrategy)
 {
     KisStrokeId id  = m_d->strokesQueue.startStroke(strokeStrategy);
     processQueues();
     return id;
 }
 
 void KisUpdateScheduler::addJob(KisStrokeId id, KisStrokeJobData *data)
 {
     m_d->strokesQueue.addJob(id, data);
     processQueues();
 }
 
 void KisUpdateScheduler::endStroke(KisStrokeId id)
 {
     m_d->strokesQueue.endStroke(id);
     processQueues();
 }
 
 bool KisUpdateScheduler::cancelStroke(KisStrokeId id)
 {
     bool result = m_d->strokesQueue.cancelStroke(id);
     processQueues();
     return result;
 }
 
 bool KisUpdateScheduler::tryCancelCurrentStrokeAsync()
 {
     return m_d->strokesQueue.tryCancelCurrentStrokeAsync();
 }
 
 UndoResult KisUpdateScheduler::tryUndoLastStrokeAsync()
 {
     return m_d->strokesQueue.tryUndoLastStrokeAsync();
 }
 
 bool KisUpdateScheduler::wrapAroundModeSupported() const
 {
     return m_d->strokesQueue.wrapAroundModeSupported();
 }
 
 void KisUpdateScheduler::setDesiredLevelOfDetail(int lod)
 {
     m_d->strokesQueue.setDesiredLevelOfDetail(lod);
 
     /**
      * The queue might have started an internal stroke for
      * cache synchronization. Process the queues to execute
      * it if needed.
      */
     processQueues();
 }
 
 void KisUpdateScheduler::explicitRegenerateLevelOfDetail()
 {
     m_d->strokesQueue.explicitRegenerateLevelOfDetail();
 
     // \see a comment in setDesiredLevelOfDetail()
     processQueues();
 }
 
 int KisUpdateScheduler::currentLevelOfDetail() const
 {
     int levelOfDetail = -1;
 
     if (levelOfDetail < 0) {
         levelOfDetail = m_d->updaterContext.currentLevelOfDetail();
     }
 
     if (levelOfDetail < 0) {
         levelOfDetail = m_d->updatesQueue.overrideLevelOfDetail();
     }
 
     if (levelOfDetail < 0) {
         levelOfDetail = 0;
     }
 
     return levelOfDetail;
 }
 
 void KisUpdateScheduler::setLod0ToNStrokeStrategyFactory(const KisLodSyncStrokeStrategyFactory &factory)
 {
     m_d->strokesQueue.setLod0ToNStrokeStrategyFactory(factory);
 }
 
 void KisUpdateScheduler::setSuspendUpdatesStrokeStrategyFactory(const KisSuspendResumeStrategyFactory &factory)
 {
     m_d->strokesQueue.setSuspendUpdatesStrokeStrategyFactory(factory);
 }
 
 void KisUpdateScheduler::setResumeUpdatesStrokeStrategyFactory(const KisSuspendResumeStrategyFactory &factory)
 {
     m_d->strokesQueue.setResumeUpdatesStrokeStrategyFactory(factory);
 }
 
 KisPostExecutionUndoAdapter *KisUpdateScheduler::lodNPostExecutionUndoAdapter() const
 {
     return m_d->strokesQueue.lodNPostExecutionUndoAdapter();
 }
 
 void KisUpdateScheduler::updateSettings()
 {
     m_d->updatesQueue.updateSettings();
 
     KisImageConfig config;
     m_d->defaultBalancingRatio = config.schedulerBalancingRatio();
 
     setThreadsLimit(config.maxNumberOfThreads());
 }
 
 void KisUpdateScheduler::lock()
 {
     m_d->processingBlocked = true;
     m_d->updaterContext.waitForDone();
 }
 
 void KisUpdateScheduler::unlock(bool resetLodLevels)
 {
     if (resetLodLevels) {
         /**
          * Legacy strokes may have changed the image while we didn't
          * control it. Notify the queue to take it into account.
          */
         m_d->strokesQueue.notifyUFOChangedImage();
     }
 
     m_d->processingBlocked = false;
     processQueues();
 }
 
 bool KisUpdateScheduler::isIdle()
 {
     bool result = false;
 
     if (tryBarrierLock()) {
         result = true;
         unlock(false);
     }
 
     return result;
 }
 
 void KisUpdateScheduler::waitForDone()
 {
     do {
         processQueues();
         m_d->updaterContext.waitForDone();
     } while(!m_d->updatesQueue.isEmpty() || !m_d->strokesQueue.isEmpty());
 }
 
 bool KisUpdateScheduler::tryBarrierLock()
 {
     if(!m_d->updatesQueue.isEmpty() || !m_d->strokesQueue.isEmpty()) {
         return false;
     }
 
     m_d->processingBlocked = true;
     m_d->updaterContext.waitForDone();
     if(!m_d->updatesQueue.isEmpty() || !m_d->strokesQueue.isEmpty()) {
         m_d->processingBlocked = false;
         processQueues();
         return false;
     }
 
     return true;
 }
 
 void KisUpdateScheduler::barrierLock()
 {
     do {
         m_d->processingBlocked = false;
         processQueues();
         m_d->processingBlocked = true;
         m_d->updaterContext.waitForDone();
     } while(!m_d->updatesQueue.isEmpty() || !m_d->strokesQueue.isEmpty());
 }
 
 void KisUpdateScheduler::processQueues()
 {
     wakeUpWaitingThreads();
 
     if(m_d->processingBlocked) return;
 
     if(m_d->strokesQueue.needsExclusiveAccess()) {
         DEBUG_BALANCING_METRICS("STROKES", "X");
         m_d->strokesQueue.processQueue(m_d->updaterContext,
                                         !m_d->updatesQueue.isEmpty());
 
         if(!m_d->strokesQueue.needsExclusiveAccess()) {
             tryProcessUpdatesQueue();
         }
     }
     else if(m_d->balancingRatio() * m_d->strokesQueue.sizeMetric() > m_d->updatesQueue.sizeMetric()) {
         DEBUG_BALANCING_METRICS("STROKES", "N");
         m_d->strokesQueue.processQueue(m_d->updaterContext,
                                         !m_d->updatesQueue.isEmpty());
         tryProcessUpdatesQueue();
     }
     else {
         DEBUG_BALANCING_METRICS("UPDATES", "N");
         tryProcessUpdatesQueue();
         m_d->strokesQueue.processQueue(m_d->updaterContext,
                                         !m_d->updatesQueue.isEmpty());
 
     }
 
     progressUpdate();
 }
 
 void KisUpdateScheduler::blockUpdates()
 {
     m_d->updatesFinishedCondition.initWaiting();
 
     m_d->updatesLockCounter.ref();
     while(haveUpdatesRunning()) {
         m_d->updatesFinishedCondition.wait();
     }
 
     m_d->updatesFinishedCondition.endWaiting();
 }
 
 void KisUpdateScheduler::unblockUpdates()
 {
     m_d->updatesLockCounter.deref();
     processQueues();
 }
 
 void KisUpdateScheduler::wakeUpWaitingThreads()
 {
     if(m_d->updatesLockCounter && !haveUpdatesRunning()) {
         m_d->updatesFinishedCondition.wakeAll();
     }
 }
 
 void KisUpdateScheduler::tryProcessUpdatesQueue()
 {
     QReadLocker locker(&m_d->updatesStartLock);
     if(m_d->updatesLockCounter) return;
 
     m_d->updatesQueue.processQueue(m_d->updaterContext);
 }
 
 bool KisUpdateScheduler::haveUpdatesRunning()
 {
     QWriteLocker locker(&m_d->updatesStartLock);
 
     qint32 numMergeJobs, numStrokeJobs;
     m_d->updaterContext.getJobsSnapshot(numMergeJobs, numStrokeJobs);
 
     return numMergeJobs;
 }
 
 void KisUpdateScheduler::continueUpdate(const QRect &rect)
 {
     Q_ASSERT(m_d->projectionUpdateListener);
     m_d->projectionUpdateListener->notifyProjectionUpdated(rect);
 }
 
 void KisUpdateScheduler::doSomeUsefulWork()
 {
     m_d->updatesQueue.optimize();
 }
 
 void KisUpdateScheduler::spareThreadAppeared()
 {
     processQueues();
 }
 
 KisTestableUpdateScheduler::KisTestableUpdateScheduler(KisProjectionUpdateListener *projectionUpdateListener,
                                                        qint32 threadCount)
 {
     Q_UNUSED(threadCount);
     updateSettings();
     m_d->projectionUpdateListener = projectionUpdateListener;
 
     // The queue will update settings in a constructor itself
     // m_d->updatesQueue = new KisTestableSimpleUpdateQueue();
     // m_d->strokesQueue = new KisStrokesQueue();
     // m_d->updaterContext = new KisTestableUpdaterContext(threadCount);
 
     connectSignals();
 }
 
 KisTestableUpdaterContext* KisTestableUpdateScheduler::updaterContext()
 {
     return dynamic_cast<KisTestableUpdaterContext*>(&m_d->updaterContext);
 }
 
 KisTestableSimpleUpdateQueue* KisTestableUpdateScheduler::updateQueue()
 {
     return dynamic_cast<KisTestableSimpleUpdateQueue*>(&m_d->updatesQueue);
 }
diff --git a/libs/ui/dialogs/KisAsyncAnimationRenderDialogBase.cpp b/libs/ui/dialogs/KisAsyncAnimationRenderDialogBase.cpp
index 1424441c1d..c12d5bc5e8 100644
--- a/libs/ui/dialogs/KisAsyncAnimationRenderDialogBase.cpp
+++ b/libs/ui/dialogs/KisAsyncAnimationRenderDialogBase.cpp
@@ -1,309 +1,333 @@
 /*
  *  Copyright (c) 2017 Dmitry Kazakov <dimula73@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 "KisAsyncAnimationRenderDialogBase.h"
 
 #include <QEventLoop>
 #include <QProgressDialog>
 #include <QElapsedTimer>
 #include <QApplication>
 #include <QThread>
 #include <QTime>
 #include <QList>
 #include <QtMath>
 
 #include <klocalizedstring.h>
 
 #include "KisViewManager.h"
 #include "KisAsyncAnimationRendererBase.h"
 #include "kis_time_range.h"
 #include "kis_image.h"
 #include "kis_image_config.h"
 #include "kis_memory_statistics_server.h"
 
 #include <vector>
 #include <memory>
 
 namespace {
 struct RendererPair {
     std::unique_ptr<KisAsyncAnimationRendererBase> renderer;
     KisImageSP image;
 
     RendererPair() {}
     RendererPair(KisAsyncAnimationRendererBase *_renderer, KisImageSP _image)
         : renderer(_renderer),
           image(_image)
     {
     }
     RendererPair(RendererPair &&rhs)
         : renderer(std::move(rhs.renderer)),
           image(rhs.image)
     {
     }
 };
 
 int calculateNumberMemoryAllowedClones(KisImageSP image)
 {
     KisMemoryStatisticsServer::Statistics stats =
         KisMemoryStatisticsServer::instance()
         ->fetchMemoryStatistics(image);
 
     const qint64 allowedMemory = 0.8 * stats.tilesHardLimit - stats.realMemorySize;
     const qint64 cloneSize = stats.projectionsSize;
 
     return allowedMemory > 0 ? allowedMemory / cloneSize : 0;
 }
 
 }
 
 
 struct KisAsyncAnimationRenderDialogBase::Private
 {
     Private(const QString &_actionTitle, KisImageSP _image, int _busyWait)
         : actionTitle(_actionTitle),
           image(_image),
           busyWait(_busyWait)
     {
     }
 
     QString actionTitle;
     KisImageSP image;
     int busyWait;
     bool isBatchMode = false;
 
     std::vector<RendererPair> asyncRenderers;
     bool memoryLimitReached = false;
 
     QElapsedTimer processingTime;
     QScopedPointer<QProgressDialog> progressDialog;
     QEventLoop waitLoop;
 
     QList<int> stillDirtyFrames;
     QList<int> framesInProgress;
     int dirtyFramesCount = 0;
     Result result = RenderComplete;
 
     int numDirtyFramesLeft() const {
         return stillDirtyFrames.size() + framesInProgress.size();
     }
 
 };
 
 KisAsyncAnimationRenderDialogBase::KisAsyncAnimationRenderDialogBase(const QString &actionTitle, KisImageSP image, int busyWait)
     : m_d(new Private(actionTitle, image, busyWait))
 {
 }
 
 KisAsyncAnimationRenderDialogBase::~KisAsyncAnimationRenderDialogBase()
 {
 }
 
 KisAsyncAnimationRenderDialogBase::Result
 KisAsyncAnimationRenderDialogBase::regenerateRange(KisViewManager *viewManager)
 {
+    {
+        /**
+         * Since this method can be called from the places where no
+         * view manager is available, we need this manually crafted
+         * ugly construction to "try-lock-cance" the image.
+         */
+
+        bool imageIsIdle = true;
+
+        if (viewManager) {
+            imageIsIdle = viewManager->blockUntilOperationsFinished(m_d->image);
+        } else {
+            imageIsIdle = false;
+            if (m_d->image->tryBarrierLock(true)) {
+                m_d->image->unlock();
+                imageIsIdle = true;
+            }
+        }
+
+        if (!imageIsIdle) {
+            return RenderCancelled;
+        }
+    }
+
     m_d->stillDirtyFrames = calcDirtyFrames();
     m_d->framesInProgress.clear();
     m_d->result = RenderComplete;
     m_d->dirtyFramesCount = m_d->stillDirtyFrames.size();
 
     if (!m_d->isBatchMode) {
         QWidget *parentWidget = viewManager ? viewManager->mainWindow() : 0;
         m_d->progressDialog.reset(new QProgressDialog(m_d->actionTitle, i18n("Cancel"), 0, 0, parentWidget));
         m_d->progressDialog->setWindowModality(Qt::ApplicationModal);
         m_d->progressDialog->setMinimum(0);
         m_d->progressDialog->setMaximum(m_d->dirtyFramesCount);
         m_d->progressDialog->setMinimumDuration(m_d->busyWait);
         connect(m_d->progressDialog.data(), SIGNAL(canceled()), SLOT(slotCancelRegeneration()));
     }
 
     if (m_d->dirtyFramesCount <= 0) return m_d->result;
 
     m_d->processingTime.start();
 
     KisImageConfig cfg;
 
     const int maxThreads = cfg.maxNumberOfThreads();
     const int numAllowedWorker = 1 + calculateNumberMemoryAllowedClones(m_d->image);
     const int proposedNumWorkers = qMin(m_d->dirtyFramesCount, cfg.frameRenderingClones());
     const int numWorkers = qMin(proposedNumWorkers, numAllowedWorker);
     const int numThreadsPerWorker = qMax(1, qCeil(qreal(maxThreads) / numWorkers));
 
     m_d->memoryLimitReached = numWorkers < proposedNumWorkers;
 
     const int oldWorkingThreadsLimit = m_d->image->workingThreadsLimit();
 
     ENTER_FUNCTION() << ppVar(numWorkers) << ppVar(numThreadsPerWorker);
 
     for (int i = 0; i < numWorkers; i++) {
         // reuse the image for one of the workers
         KisImageSP image = i == numWorkers - 1 ? m_d->image : m_d->image->clone(true);
 
         image->setWorkingThreadsLimit(numThreadsPerWorker);
         KisAsyncAnimationRendererBase *renderer = createRenderer(image);
 
         connect(renderer, SIGNAL(sigFrameCompleted(int)), SLOT(slotFrameCompleted(int)));
         connect(renderer, SIGNAL(sigFrameCancelled(int)), SLOT(slotFrameCancelled(int)));
 
         m_d->asyncRenderers.push_back(RendererPair(renderer, image));
     }
 
     ENTER_FUNCTION() << "Copying done in" << m_d->processingTime.elapsed();
 
     tryInitiateFrameRegeneration();
     updateProgressLabel();
 
     if (m_d->numDirtyFramesLeft() > 0) {
         m_d->waitLoop.exec();
     }
 
     ENTER_FUNCTION() << "Full regeneration done in" << m_d->processingTime.elapsed();
 
     for (auto &pair : m_d->asyncRenderers) {
         KIS_SAFE_ASSERT_RECOVER_NOOP(!pair.renderer->isActive());
         if (viewManager) {
             viewManager->blockUntilOperationsFinishedForced(pair.image);
         } else {
             pair.image->barrierLock(true);
             pair.image->unlock();
         }
 
     }
     m_d->asyncRenderers.clear();
 
     if (viewManager) {
         viewManager->blockUntilOperationsFinishedForced(m_d->image);
     } else {
         m_d->image->barrierLock(true);
         m_d->image->unlock();
     }
 
     m_d->image->setWorkingThreadsLimit(oldWorkingThreadsLimit);
 
     m_d->progressDialog.reset();
 
     return m_d->result;
 }
 
 void KisAsyncAnimationRenderDialogBase::slotFrameCompleted(int frame)
 {
     Q_UNUSED(frame);
 
     m_d->framesInProgress.removeOne(frame);
 
     tryInitiateFrameRegeneration();
     updateProgressLabel();
 }
 
 void KisAsyncAnimationRenderDialogBase::slotFrameCancelled(int frame)
 {
     Q_UNUSED(frame);
 
     cancelProcessingImpl(false);
 }
 
 void KisAsyncAnimationRenderDialogBase::slotCancelRegeneration()
 {
     cancelProcessingImpl(true);
 }
 
 void KisAsyncAnimationRenderDialogBase::cancelProcessingImpl(bool isUserCancelled)
 {
     for (auto &pair : m_d->asyncRenderers) {
         if (pair.renderer->isActive()) {
             pair.renderer->cancelCurrentFrameRendering();
         }
         KIS_SAFE_ASSERT_RECOVER_NOOP(!pair.renderer->isActive());
     }
 
     m_d->stillDirtyFrames.clear();
     m_d->framesInProgress.clear();
     m_d->result = isUserCancelled ? RenderCancelled : RenderFailed;
     updateProgressLabel();
 }
 
 
 void KisAsyncAnimationRenderDialogBase::tryInitiateFrameRegeneration()
 {
     bool hadWorkOnPreviousCycle = false;
 
     while (!m_d->stillDirtyFrames.isEmpty()) {
         for (auto &pair : m_d->asyncRenderers) {
             if (!pair.renderer->isActive()) {
                 const int currentDirtyFrame = m_d->stillDirtyFrames.takeFirst();
 
                 initializeRendererForFrame(pair.renderer.get(), pair.image, currentDirtyFrame);
                 pair.renderer->startFrameRegeneration(pair.image, currentDirtyFrame);
                 hadWorkOnPreviousCycle = true;
                 m_d->framesInProgress.append(currentDirtyFrame);
                 break;
             }
         }
 
         if (!hadWorkOnPreviousCycle) break;
         hadWorkOnPreviousCycle = false;
     }
 }
 
 void KisAsyncAnimationRenderDialogBase::updateProgressLabel()
 {
     const int processedFramesCount = m_d->dirtyFramesCount - m_d->numDirtyFramesLeft();
 
     const qint64 elapsedMSec = m_d->processingTime.elapsed();
     const qint64 estimatedMSec =
         !processedFramesCount ? 0 :
         elapsedMSec * m_d->dirtyFramesCount / processedFramesCount;
 
     const QTime elapsedTime = QTime::fromMSecsSinceStartOfDay(elapsedMSec);
     const QTime estimatedTime = QTime::fromMSecsSinceStartOfDay(estimatedMSec);
 
     const QString timeFormat = estimatedTime.hour() > 0 ? "HH:mm:ss" : "mm:ss";
 
     const QString elapsedTimeString = elapsedTime.toString(timeFormat);
     const QString estimatedTimeString = estimatedTime.toString(timeFormat);
 
     const QString memoryLimitMessage(
         i18n("\n\nMemory limit is reached!\nThe number of clones is limited to %1\n\n",
              m_d->asyncRenderers.size()));
 
 
     const QString progressLabel(i18n("%1\n\nElapsed: %2\nEstimated: %3\n\n%4",
                                      m_d->actionTitle,
                                      elapsedTimeString,
                                      estimatedTimeString,
                                      m_d->memoryLimitReached ? memoryLimitMessage : QString()));
     if (m_d->progressDialog) {
         m_d->progressDialog->setLabelText(progressLabel);
         m_d->progressDialog->setValue(processedFramesCount);
     }
 
     if (!m_d->numDirtyFramesLeft()) {
         m_d->waitLoop.quit();
     }
 }
 
 
 
 void KisAsyncAnimationRenderDialogBase::setBatchMode(bool value)
 {
     m_d->isBatchMode = value;
 }
 
 bool KisAsyncAnimationRenderDialogBase::batchMode() const
 {
     return m_d->isBatchMode;
 }