diff --git a/src/kdefrontend/datasources/MQTTSubscriptionWidget.cpp b/src/kdefrontend/datasources/MQTTSubscriptionWidget.cpp
index f65b2ed0d..5417fb5c1 100644
--- a/src/kdefrontend/datasources/MQTTSubscriptionWidget.cpp
+++ b/src/kdefrontend/datasources/MQTTSubscriptionWidget.cpp
@@ -1,1023 +1,1024 @@
 /***************************************************************************
 File                 : MQTTSubscriptionWidget.cpp
 Project              : LabPlot
 Description          : Widget for managing topics and subscribing
 --------------------------------------------------------------------
 Copyright            : (C) 2019 by Kovacs Ferencz (kferike98@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 "MQTTSubscriptionWidget.h"
 
 #ifdef HAVE_MQTT
 #include "backend/datasources/MQTTClient.h"
 #include "ImportFileWidget.h"
 #include "kdefrontend/dockwidgets/LiveDataDock.h"
 
 #include <QMqttSubscription>
 #include <QMessageBox>
 #include <KLocalizedString>
 #include <QCompleter>
 #include <QTreeWidget>
 #include <QTreeWidgetItem>
 
-
 /*!
    \class MQTTSubscriptionWidget
    \brief Widget for managing topics and subscribing.
 
    \ingroup kdefrontend
 */
 MQTTSubscriptionWidget::MQTTSubscriptionWidget( QWidget* parent): QWidget(parent),
     m_parentWidget(parent),
     m_searchTimer(new QTimer(this))
 {
     if(dynamic_cast<class ImportFileWidget*>(parent) != nullptr)
         m_parent = MQTTParentWidget::ImportFileWidget;
     else
         m_parent = MQTTParentWidget::LiveDataDock;
 
     ui.setupUi(this);
 
     m_searchTimer->setInterval(10000);
     const int size = ui.leTopics->height();
     ui.lTopicSearch->setPixmap( QIcon::fromTheme(QLatin1String("go-next")).pixmap(size, size) );
     ui.lSubscriptionSearch->setPixmap( QIcon::fromTheme(QLatin1String("go-next")).pixmap(size, size) );
     ui.bSubscribe->setIcon(ui.bSubscribe->style()->standardIcon(QStyle::SP_ArrowRight));
     ui.bSubscribe->setToolTip(i18n("Subscribe selected topics"));
     ui.bUnsubscribe->setIcon(ui.bUnsubscribe->style()->standardIcon(QStyle::SP_ArrowLeft));
     ui.bUnsubscribe->setToolTip(i18n("Unsubscribe selected topics"));
 
 	//subscribe/unsubscribe buttons only enabled if something was selected
 	ui.bSubscribe->setEnabled(false);
 	ui.bUnsubscribe->setEnabled(false);
 
     QString info = i18n("Enter the name of the topic to navigate to it.");
+	QString placeholder = i18n("Enter the name of the topic");
     ui.lTopicSearch->setToolTip(info);
     ui.leTopics->setToolTip(info);
+	ui.leTopics->setPlaceholderText(placeholder);
     ui.lSubscriptionSearch->setToolTip(info);
     ui.leSubscriptions->setToolTip(info);
+	ui.leSubscriptions->setPlaceholderText(placeholder);
 
     info = i18n("Set the Quality of Service (QoS) for the subscription to define the guarantee of the message delivery:"
                 "<ul>"
                 "<li>0 - deliver at most once</li>"
                 "<li>1 - deliver at least once</li>"
                 "<li>2 - deliver exactly once</li>"
                 "</ul>");
     ui.cbQos->setToolTip(info);
 
     if(m_parent == MQTTParentWidget::ImportFileWidget) {
         connect(dynamic_cast<class ImportFileWidget*>(m_parentWidget), &ImportFileWidget::newTopic, this, &MQTTSubscriptionWidget::setTopicCompleter);
         connect(dynamic_cast<class ImportFileWidget*>(m_parentWidget), &ImportFileWidget::updateSubscriptionTree, this, &MQTTSubscriptionWidget::updateSubscriptionTree);
         connect(dynamic_cast<class ImportFileWidget*>(m_parentWidget), &ImportFileWidget::MQTTClearTopics, this, &MQTTSubscriptionWidget::clearWidgets);
     } else {
         connect(dynamic_cast<class LiveDataDock*>(m_parentWidget), &LiveDataDock::MQTTClearTopics, this, &MQTTSubscriptionWidget::clearWidgets);
         connect(dynamic_cast<class LiveDataDock*>(m_parentWidget), &LiveDataDock::newTopic, this, &MQTTSubscriptionWidget::setTopicCompleter);
         connect(dynamic_cast<class LiveDataDock*>(m_parentWidget), &LiveDataDock::updateSubscriptionTree, this, &MQTTSubscriptionWidget::updateSubscriptionTree);
     }
 
     connect(ui.bSubscribe,  &QPushButton::clicked, this, &MQTTSubscriptionWidget::mqttSubscribe);
     connect(ui.bUnsubscribe, &QPushButton::clicked, this,&MQTTSubscriptionWidget::mqttUnsubscribe);
 
     connect(m_searchTimer, &QTimer::timeout, this, &MQTTSubscriptionWidget::topicTimeout);
     connect(ui.leTopics, &QLineEdit::textChanged, this, &MQTTSubscriptionWidget::scrollToTopicTreeItem);
     connect(ui.leSubscriptions, &QLineEdit::textChanged, this, &MQTTSubscriptionWidget::scrollToSubsriptionTreeItem);
     connect(ui.twTopics, &QTreeWidget::itemDoubleClicked, this, &MQTTSubscriptionWidget::mqttAvailableTopicDoubleClicked);
     connect(ui.twSubscriptions, &QTreeWidget::itemDoubleClicked, this, &MQTTSubscriptionWidget::mqttSubscribedTopicDoubleClicked);
 	connect(ui.twSubscriptions, &QTreeWidget::currentItemChanged, this, &MQTTSubscriptionWidget::subscriptionChanged);
 
 	connect(ui.twTopics, &QTreeWidget::itemSelectionChanged, this, [=]() {
 		ui.bSubscribe->setEnabled(!ui.twTopics->selectedItems().isEmpty());
 	});
 
 	connect(ui.twSubscriptions, &QTreeWidget::itemSelectionChanged, this, [=]() {
 		ui.bUnsubscribe->setEnabled(!ui.twSubscriptions->selectedItems().isEmpty());
 	});
 }
 
 MQTTSubscriptionWidget::~MQTTSubscriptionWidget() {
     m_searchTimer->stop();
     delete m_searchTimer;
 }
 
 void MQTTSubscriptionWidget::setTopicList(QStringList topicList) {
     m_topicList = topicList;
 }
 
 QStringList MQTTSubscriptionWidget::getTopicList() {
     return m_topicList;
 }
 
 int MQTTSubscriptionWidget::subscriptionCount() {
     return ui.twSubscriptions->topLevelItemCount();
 }
 
 QTreeWidgetItem* MQTTSubscriptionWidget::topLevelTopic(int index){
     return ui.twTopics->topLevelItem(index);
 }
 
 QTreeWidgetItem* MQTTSubscriptionWidget::topLevelSubscription(int index){
     return ui.twSubscriptions->topLevelItem(index);
 }
 
 void MQTTSubscriptionWidget::addTopic(QTreeWidgetItem* item) {
     ui.twTopics->addTopLevelItem(item);
 }
 
 int MQTTSubscriptionWidget::topicCount() {
     return ui.twTopics->topLevelItemCount();
 }
 
 void MQTTSubscriptionWidget::setTopicTreeText(const QString &text) {
     ui.twTopics->headerItem()->setText(0, text);
 }
 
 QTreeWidgetItem* MQTTSubscriptionWidget::currentItem() const {
 	return ui.twSubscriptions->currentItem();
 }
 
 void MQTTSubscriptionWidget::makeVisible(bool visible) {
     ui.cbQos->setVisible(visible);
     ui.twTopics->setVisible(visible);
     ui.twSubscriptions->setVisible(visible);
     ui.leTopics->setVisible(visible);
     ui.leSubscriptions->setVisible(visible);
     ui.bSubscribe->setVisible(visible);
     ui.bUnsubscribe->setVisible(visible);
     ui.lTopicSearch->setVisible(visible);
     ui.lSubscriptionSearch->setVisible(visible);
 }
 
 void MQTTSubscriptionWidget::testSubscribe(QTreeWidgetItem *item) {
     ui.twTopics->setCurrentItem(item);
     mqttSubscribe();
 }
 
 void MQTTSubscriptionWidget::testUnsubscribe(QTreeWidgetItem *item) {
     ui.twTopics->setCurrentItem(item);
     mqttUnsubscribe();
 }
 
 /*!
  *\brief Fills the children vector, with the root item's (twSubscriptions) leaf children (meaning no wildcard containing topics)
  *
  * \param children vector of TreeWidgetItem pointers
  * \param root pointer to a TreeWidgetItem of twSubscriptions
  */
 void MQTTSubscriptionWidget::findSubscriptionLeafChildren(QVector<QTreeWidgetItem *>& children, QTreeWidgetItem* root) {
     if (root->childCount() == 0)
         children.push_back(root);
     else
         for (int i = 0; i < root->childCount(); ++i)
             findSubscriptionLeafChildren(children, root->child(i));
 }
 
 /*!
  *\brief Checks if a topic contains another one
  *
  * \param superior the name of a topic
  * \param inferior the name of a topic
  * \return	true if superior is equal to or contains(if superior contains wildcards) inferior,
  *			false otherwise
  */
 bool MQTTSubscriptionWidget::checkTopicContains(const QString& superior, const QString& inferior) {
     if (superior == inferior)
         return true;
 
     if (!superior.contains('/'))
         return false;
 
     const QStringList& superiorList = superior.split('/', QString::SkipEmptyParts);
     const QStringList& inferiorList = inferior.split('/', QString::SkipEmptyParts);
 
     //a longer topic can't contain a shorter one
     if (superiorList.size() > inferiorList.size())
         return false;
 
     bool ok = true;
     for (int i = 0; i < superiorList.size(); ++i) {
         if (superiorList.at(i) != inferiorList.at(i)) {
             if ((superiorList.at(i) != "+") &&
                     !(superiorList.at(i) == "#" && i == superiorList.size() - 1)) {
                 //if the two topics differ, and the superior's current level isn't + or #(which can be only in the last position)
                 //then superior can't contain inferior
                 ok = false;
                 break;
             } else if (i == superiorList.size() - 1 && (superiorList.at(i) == "+" && inferiorList.at(i) == "#") ) {
                 //if the two topics differ at the last level
                 //and the superior's current level is + while the inferior's is #(which can be only in the last position)
                 //then superior can't contain inferior
                 ok = false;
                 break;
             }
         }
     }
     return ok;
 }
 
 /*!
  *\brief Starts unsubscribing from the given topic, and signals to ImportFileWidget for further actions
  *
  * \param topicName the name of a topic we want to unsubscribe from
  */
 void MQTTSubscriptionWidget::unsubscribeFromTopic(const QString& topicName) {
     if (topicName.isEmpty())
         return;
 
     QVector<QTreeWidgetItem*> children;
     findSubscriptionLeafChildren(children, ui.twSubscriptions->topLevelItem(0));
 
     //signals for ImportFileWidget
     emit MQTTUnsubscribeFromTopic(topicName, children);
 
     for (int row = 0; row < ui.twSubscriptions->topLevelItemCount(); row++)  {
         if (ui.twSubscriptions->topLevelItem(row)->text(0) == topicName) {
             ui.twSubscriptions->topLevelItem(row)->takeChildren();
             ui.twSubscriptions->takeTopLevelItem(row);
         }
     }
 }
 
 /*!
  *\brief We search in twSubscriptions for topics that can be represented using + wildcards, then merge them.
  *		 We do this until there are no topics to merge
  */
 void MQTTSubscriptionWidget::manageCommonLevelSubscriptions() {
     bool foundEqual = false;
 
     do {
         foundEqual = false;
         QMap<QString, QVector<QString>> equalTopicsMap;
         QVector<QString> equalTopics;
 
         //compare the subscriptions present in the TreeWidget
         for (int i = 0; i < ui.twSubscriptions->topLevelItemCount() - 1; ++i) {
             for (int j = i + 1; j < ui.twSubscriptions->topLevelItemCount(); ++j) {
                 QString commonTopic = checkCommonLevel(ui.twSubscriptions->topLevelItem(i)->text(0), ui.twSubscriptions->topLevelItem(j)->text(0));
 
                 //if there is a common topic for the 2 compared topics, we add them to the map (using the common topic as key)
                 if (!commonTopic.isEmpty()) {
                     if (!equalTopicsMap[commonTopic].contains(ui.twSubscriptions->topLevelItem(i)->text(0)))
                         equalTopicsMap[commonTopic].push_back(ui.twSubscriptions->topLevelItem(i)->text(0));
 
                     if (!equalTopicsMap[commonTopic].contains(ui.twSubscriptions->topLevelItem(j)->text(0)))
                         equalTopicsMap[commonTopic].push_back(ui.twSubscriptions->topLevelItem(j)->text(0));
                 }
             }
         }
 
         if (!equalTopicsMap.isEmpty()) {
             DEBUG("Manage common topics");
 
             QVector<QString> commonTopics;
             QMapIterator<QString, QVector<QString>> topics(equalTopicsMap);
 
             //check for every map entry, if the found topics can be merged or not
             while (topics.hasNext()) {
                 topics.next();
 
                 int level = commonLevelIndex(topics.value().last(), topics.value().first());
                 QStringList commonList = topics.value().first().split('/', QString::SkipEmptyParts);
                 QTreeWidgetItem* currentItem = nullptr;
 
                 //search the corresponding item to the common topics first level(root)
                 for (int i = 0; i < ui.twTopics->topLevelItemCount(); ++i) {
                     if (ui.twTopics->topLevelItem(i)->text(0) == commonList.first()) {
                         currentItem = ui.twTopics->topLevelItem(i);
                         break;
                     }
                 }
 
                 if (!currentItem)
                     break;
 
                 //calculate the number of topics the new + wildcard could replace
                 int childCount = checkCommonChildCount(1, level, commonList, currentItem);
                 if (childCount > 0) {
                     //if the number of topics found and the calculated number of topics is equal, the topics can be merged
                     if (topics.value().size() == childCount) {
                         QDEBUG("Found common topic to manage: " << topics.key());
                         foundEqual = true;
                         commonTopics.push_back(topics.key());
                     }
                 }
             }
 
             if (foundEqual) {
                 //if there are more common topics, the topics of which can be merged, we choose the one which has the lowest level new '+' wildcard
                 int lowestLevel = INT_MAX;
                 int topicIdx = -1;
                 for (int i = 0; i < commonTopics.size(); ++i) {
                     int level = commonLevelIndex(equalTopicsMap[commonTopics[i]].first(), commonTopics[i]);
                     if (level < lowestLevel) {
                         topicIdx = i;
                         lowestLevel = level;
                     }
                 }
                 QDEBUG("Manage: " << commonTopics[topicIdx]);
                 equalTopics.append(equalTopicsMap[commonTopics[topicIdx]]);
 
                 //Add the common topic ("merging")
                 QString commonTopic;
                 commonTopic = checkCommonLevel(equalTopics.first(), equalTopics.last());
                 QStringList nameList;
                 nameList.append(commonTopic);
                 QTreeWidgetItem* newTopic = new QTreeWidgetItem(nameList);
                 ui.twSubscriptions->addTopLevelItem(newTopic);
 
                 if(m_parent == MQTTParentWidget::ImportFileWidget)
                     emit makeSubscription(commonTopic, static_cast<quint8> (ui.cbQos->currentText().toUInt()));
 
                 //remove the "merged" topics
                 for (int i = 0; i < equalTopics.size(); ++i) {
                     for (int j = 0; j < ui.twSubscriptions->topLevelItemCount(); ++j) {
                         if (ui.twSubscriptions->topLevelItem(j)->text(0) == equalTopics[i]) {
                             newTopic->addChild(ui.twSubscriptions->takeTopLevelItem(j));
 
                             if(m_parent == MQTTParentWidget::ImportFileWidget) {
                                 unsubscribeFromTopic(equalTopics[i]);
                             }
 
                             break;
                         }
                     }
                 }
 
                 //remove any subscription that the new subscription contains
                 for (int i = 0; i < ui.twSubscriptions->topLevelItemCount(); ++i) {
                     if (checkTopicContains(commonTopic, ui.twSubscriptions->topLevelItem(i)->text(0)) &&
                             commonTopic != ui.twSubscriptions->topLevelItem(i)->text(0) ) {
                         if(m_parent == MQTTParentWidget::ImportFileWidget) {
                             unsubscribeFromTopic(ui.twSubscriptions->topLevelItem(i)->text(0));
                         } else {
                             ui.twSubscriptions->topLevelItem(i)->takeChildren();
                             ui.twSubscriptions->takeTopLevelItem(i);
                         }
                         i--;
                     }
                 }
 
                 if(m_parent == MQTTParentWidget::LiveDataDock)
                     emit makeSubscription(commonTopic, static_cast<quint8> (ui.cbQos->currentText().toUInt()));
             }
         }
     } while (foundEqual);
 }
 
 /*!
  *\brief Fills twSubscriptions with the subscriptions made by the client
  */
 void MQTTSubscriptionWidget::updateSubscriptionTree(const QVector<QString>& mqttSubscriptions) {
     DEBUG("ImportFileWidget::updateSubscriptionTree()");
     ui.twSubscriptions->clear();
 
     for (int i = 0; i < mqttSubscriptions.size(); ++i) {
         QStringList name;
         name.append(mqttSubscriptions[i]);
 
         bool found = false;
         for (int j = 0; j < ui.twSubscriptions->topLevelItemCount(); ++j) {
             if (ui.twSubscriptions->topLevelItem(j)->text(0) == mqttSubscriptions[i]) {
                 found = true;
                 break;
             }
         }
 
         if (!found) {
             //Add the subscription to the tree widget
             QTreeWidgetItem* newItem = new QTreeWidgetItem(name);
             ui.twSubscriptions->addTopLevelItem(newItem);
             name.clear();
             name = mqttSubscriptions[i].split('/', QString::SkipEmptyParts);
 
             //find the corresponding "root" item in twTopics
             QTreeWidgetItem* topic = nullptr;
             for (int j = 0; j < ui.twTopics->topLevelItemCount(); ++j) {
                 if (ui.twTopics->topLevelItem(j)->text(0) == name[0]) {
                     topic = ui.twTopics->topLevelItem(j);
                     break;
                 }
             }
 
             //restore the children of the subscription
             if (topic != nullptr && topic->childCount() > 0)
                 restoreSubscriptionChildren(topic, newItem, name, 1);
         }
     }
     m_searching = false;
 }
 
 /*!
  *\brief Adds to a # wildcard containing topic, every topic present in twTopics that the former topic contains
  *
  * \param topic pointer to the TreeWidgetItem which was selected before subscribing
  * \param subscription pointer to the TreeWidgetItem which represents the new subscirption,
  *		  we add all of the children to this item
  */
 void MQTTSubscriptionWidget::addSubscriptionChildren(QTreeWidgetItem* topic, QTreeWidgetItem* subscription) {
     //if the topic doesn't have any children we don't do anything
     if (topic->childCount() <= 0)
         return;
 
     for (int i = 0; i < topic->childCount(); ++i) {
         QTreeWidgetItem* temp = topic->child(i);
         QString name;
         //if it has children, then we add it as a # wildcrad containing topic
         if (topic->child(i)->childCount() > 0) {
             name.append(temp->text(0) + "/#");
             while (temp->parent() != nullptr) {
                 temp = temp->parent();
                 name.prepend(temp->text(0) + '/');
             }
         }
 
         //if not then we simply add the topic itself
         else {
             name.append(temp->text(0));
             while (temp->parent() != nullptr) {
                 temp = temp->parent();
                 name.prepend(temp->text(0) + '/');
             }
         }
 
         QStringList nameList;
         nameList.append(name);
         QTreeWidgetItem* childItem = new QTreeWidgetItem(nameList);
         subscription->addChild(childItem);
         //we use the function recursively on the given item
         addSubscriptionChildren(topic->child(i), childItem);
     }
 }
 
 /*!
  *\brief Restores the children of a top level item in twSubscriptions if it contains wildcards
  *
  * \param topic pointer to a top level item in twTopics which represents the root of the subscription topic
  * \param subscription pointer to a top level item in twSubscriptions, this is the item whose children will be restored
  * \param list QStringList containing the levels of the subscription topic
  * \param level the level's number which is being investigated
  */
 void MQTTSubscriptionWidget::restoreSubscriptionChildren(QTreeWidgetItem * topic, QTreeWidgetItem * subscription, const QStringList& list, int level) {
     if (list[level] != "+" && list[level] != "#" && level < list.size() - 1) {
         for (int i = 0; i < topic->childCount(); ++i) {
             //if the current level isn't + or # wildcard we recursively continue with the next level
             if (topic->child(i)->text(0) == list[level]) {
                 restoreSubscriptionChildren(topic->child(i), subscription, list, level + 1);
                 break;
             }
         }
     } else if (list[level] == "+") {
         for (int i = 0; i < topic->childCount(); ++i) {
             //determine the name of the topic, contained by the subscription
             QString name;
             name.append(topic->child(i)->text(0));
             for (int j = level + 1; j < list.size(); ++j)
                 name.append('/' + list[j]);
 
             QTreeWidgetItem* temp = topic->child(i);
             while (temp->parent() != nullptr) {
                 temp = temp->parent();
                 name.prepend(temp->text(0) + '/');
             }
 
             //Add the topic as child of the subscription
             QStringList nameList;
             nameList.append(name);
             QTreeWidgetItem* newItem = new QTreeWidgetItem(nameList);
             subscription->addChild(newItem);
             //Continue adding children recursively to the new item
             restoreSubscriptionChildren(topic->child(i), newItem, list, level + 1);
         }
     } else if (list[level] == "#") {
         //add the children of the # wildcard containing subscription
         addSubscriptionChildren(topic, subscription);
     }
 }
 
 /*!
  *\brief Returns the amount of topics that the '+' wildcard will replace in the level position
  *
  * \param levelIdx the level currently being investigated
  * \param level the level where the new + wildcard will be placed
  * \param commonList the topic name split into levels
  * \param currentItem pointer to a TreeWidgetItem which represents the parent of the level
  *		  represented by levelIdx
  * \return returns the childCount, or -1 if some topics already represented by + wildcard have different
  *		   amount of children
  */
 int MQTTSubscriptionWidget::checkCommonChildCount(int levelIdx, int level, QStringList& commonList, QTreeWidgetItem* currentItem) {
     //we recursively check the number of children, until we get to level-1
     if (levelIdx < level - 1) {
         if (commonList[levelIdx] != "+") {
             for (int j = 0; j < currentItem->childCount(); ++j) {
                 if (currentItem->child(j)->text(0) == commonList[levelIdx]) {
                     //if the level isn't represented by + wildcard we simply return the amount of children of the corresponding item, recursively
                     return checkCommonChildCount(levelIdx + 1, level, commonList, currentItem->child(j));
                 }
             }
         } else {
             int childCount = -1;
             bool ok = true;
 
             //otherwise we check if every + wildcard represented topic has the same number of children, recursively
             for (int j = 0; j < currentItem->childCount(); ++j) {
                 int temp = checkCommonChildCount(levelIdx + 1, level, commonList, currentItem->child(j));
                 if ((j > 0) && (temp != childCount)) {
                     ok = false;
                     break;
                 }
                 childCount = temp;
             }
 
             //if yes we return this number, otherwise -1
             if (ok)
                 return childCount;
             else
                 return -1;
         }
     } else if (levelIdx == level - 1) {
         if (commonList[levelIdx] != "+") {
             for (int j = 0; j < currentItem->childCount(); ++j) {
                 if (currentItem->child(j)->text(0) == commonList[levelIdx]) {
                     //if the level isn't represented by + wildcard we simply return the amount of children of the corresponding item
                     return currentItem->child(j)->childCount();
                 }
             }
         } else {
             int childCount = -1;
             bool ok = true;
 
             //otherwise we check if every + wildcard represented topic has the same number of children
             for (int j = 0; j < currentItem->childCount(); ++j) {
                 if ((j > 0) && (currentItem->child(j)->childCount() != childCount)) {
                     ok = false;
                     break;
                 }
                 childCount = currentItem->child(j)->childCount();
             }
 
             //if yes we return this number, otherwise -1
             if (ok)
                 return childCount;
             else
                 return -1;
         }
 
     } else if (level == 1 && levelIdx == 1)
         return currentItem->childCount();
 
     return -1;
 }
 
 
 /*!
  *\brief Returns the index of level where the two topic names differ, if there is a common topic for them
  *
  * \param first the name of a topic
  * \param second the name of a topic
  * \return The index of the unequal level, if there is a common topic, otherwise -1
  */
 int MQTTSubscriptionWidget::commonLevelIndex(const QString& first, const QString& second) {
     QStringList firstList = first.split('/', QString::SkipEmptyParts);
     QStringList secondtList = second.split('/', QString::SkipEmptyParts);
     QString commonTopic;
     int differIndex = -1;
 
     if (!firstList.isEmpty()) {
         //the two topics have to be the same size and can't be identic
         if (firstList.size() == secondtList.size() && (first != second))	{
 
             //the index where they differ
             for (int i = 0; i < firstList.size(); ++i) {
                 if (firstList.at(i) != secondtList.at(i)) {
                     differIndex = i;
                     break;
                 }
             }
 
             //they can differ at only one level
             bool differ = false;
             if (differIndex > 0) {
                 for (int j = differIndex + 1; j < firstList.size(); ++j) {
                     if (firstList.at(j) != secondtList.at(j)) {
                         differ = true;
                         break;
                     }
                 }
             }
             else
                 differ = true;
 
             if (!differ) {
                 for (int i = 0; i < firstList.size(); ++i) {
                     if (i != differIndex)
                         commonTopic.append(firstList.at(i));
                     else
                         commonTopic.append('+');
 
                     if (i != firstList.size() - 1)
                         commonTopic.append('/');
                 }
             }
         }
     }
 
     //if there is a common topic we return the differIndex
     if (!commonTopic.isEmpty())
         return differIndex;
     else
         return -1;
 }
 
 /*!
  *\brief Returns the '+' wildcard containing topic name, which includes the given topic names
  *
  * \param first the name of a topic
  * \param second the name of a topic
  * \return The name of the common topic, if it exists, otherwise ""
  */
 QString MQTTSubscriptionWidget::checkCommonLevel(const QString& first, const QString& second) {
     const QStringList& firstList = first.split('/', QString::SkipEmptyParts);
     if (firstList.isEmpty())
         return QString();
 
     const QStringList& secondtList = second.split('/', QString::SkipEmptyParts);
     QString commonTopic;
 
     //the two topics have to be the same size and can't be identic
     if (firstList.size() == secondtList.size() && (first != second))	{
 
         //the index where they differ
         int differIndex = -1;
         for (int i = 0; i < firstList.size(); ++i) {
             if (firstList.at(i) != secondtList.at(i)) {
                 differIndex = i;
                 break;
             }
         }
 
         //they can differ at only one level
         bool differ = false;
         if (differIndex > 0) {
             for (int j = differIndex + 1; j < firstList.size(); ++j) {
                 if (firstList.at(j) != secondtList.at(j)) {
                     differ = true;
                     break;
                 }
             }
         } else
             differ = true;
 
         if (!differ) {
             for (int i = 0; i < firstList.size(); ++i) {
                 if (i != differIndex) {
                     commonTopic.append(firstList.at(i));
                 } else {
                     //we put '+' wildcard at the level where they differ
                     commonTopic.append('+');
                 }
 
                 if (i != firstList.size() - 1)
                     commonTopic.append('/');
             }
         }
     }
 
 // 	qDebug() << "Common topic for " << first << " and " << second << " is: " << commonTopic;
     return commonTopic;
 }
 
 /************** SLOTS **************************************************************/
 
 /*!
  *\brief When a leaf topic is double clicked in the topics tree widget we subscribe on that
  */
 void MQTTSubscriptionWidget::mqttAvailableTopicDoubleClicked(QTreeWidgetItem* item, int column) {
     Q_UNUSED(column)
     // Only for leaf topics
     if (item->childCount() == 0)
         mqttSubscribe();
 }
 
 /*!
  *\brief When a leaf subscription is double clicked in the topics tree widget we unsubscribe
  */
 void MQTTSubscriptionWidget::mqttSubscribedTopicDoubleClicked(QTreeWidgetItem* item, int column) {
     Q_UNUSED(column)
     // Only for leaf subscriptions
     if (item->childCount() == 0)
         mqttUnsubscribe();
 }
 
 /*!
  *\brief called when the subscribe button is pressed
  * subscribes to the topic represented by the current item of twTopics
  */
 void MQTTSubscriptionWidget::mqttSubscribe() {
     QTreeWidgetItem* item = ui.twTopics->currentItem();
     if (!item)
         return; //should never happen
 
     //determine the topic name that the current item represents
     QTreeWidgetItem* tempItem = item;
     QString name = item->text(0);
     if (item->childCount() != 0)
         name.append("/#");
 
     while (tempItem->parent()) {
         tempItem = tempItem->parent();
         name.prepend(tempItem->text(0) + '/');
     }
 
     //check if the subscription already exists
     const QList<QTreeWidgetItem*>& topLevelList = ui.twSubscriptions->findItems(name, Qt::MatchExactly);
     if (topLevelList.isEmpty() || topLevelList.first()->parent() != nullptr) {
         QDEBUG("Subscribe to: " << name);
         bool foundSuperior = false;
 
         for (int i = 0; i < ui.twSubscriptions->topLevelItemCount(); ++i) {
             //if the new subscirptions contains an already existing one, we remove the inferior one
             if (checkTopicContains(name, ui.twSubscriptions->topLevelItem(i)->text(0))
                     && name != ui.twSubscriptions->topLevelItem(i)->text(0)) {
                 if(m_parent == MQTTParentWidget::ImportFileWidget) {
                     unsubscribeFromTopic(ui.twSubscriptions->topLevelItem(i)->text(0));
                 }
                 else {
                     ui.twSubscriptions->topLevelItem(i)->takeChildren();
                     ui.twSubscriptions->takeTopLevelItem(i);
                 }
                 --i;
                 continue;
             }
 
             //if there is a subscription containing the new one we set foundSuperior true
             if (checkTopicContains(ui.twSubscriptions->topLevelItem(i)->text(0), name)
                     && name != ui.twSubscriptions->topLevelItem(i)->text(0)) {
                 foundSuperior = true;
                 QDEBUG("Can't continue subscribing. Found superior for " << name << " : " << ui.twSubscriptions->topLevelItem(i)->text(0));
                 break;
             }
         }
 
         //if there wasn't a superior subscription we can subscribe to the new topic
         if (!foundSuperior) {
             QStringList toplevelName;
             toplevelName.push_back(name);
             QTreeWidgetItem* newTopLevelItem = new QTreeWidgetItem(toplevelName);
             ui.twSubscriptions->addTopLevelItem(newTopLevelItem);
 
             if (name.endsWith('#')) {
                 //adding every topic that the subscription contains to twSubscriptions
                 addSubscriptionChildren(item, newTopLevelItem);
             }
 
             emit makeSubscription(name, static_cast<quint8>(ui.cbQos->currentText().toUInt()));
 
             if (name.endsWith('#')) {
                 //if an already existing subscription contains a topic that the new subscription also contains
                 //we decompose the already existing subscription
                 //by unsubscribing from its topics, that are present in the new subscription as well
                 const QStringList nameList = name.split('/', QString::SkipEmptyParts);
                 const QString& root = nameList.first();
                 QVector<QTreeWidgetItem*> children;
                 for (int i = 0; i < ui.twSubscriptions->topLevelItemCount(); ++i) {
                     if (ui.twSubscriptions->topLevelItem(i)->text(0).startsWith(root)
                             && name != ui.twSubscriptions->topLevelItem(i)->text(0)) {
                         children.clear();
                         //get the "leaf" children of the inspected subscription
                         findSubscriptionLeafChildren(children, ui.twSubscriptions->topLevelItem(i));
                         for (int j = 0; j < children.size(); ++j) {
                             if (checkTopicContains(name, children[j]->text(0))) {
                                 //if the new subscription contains a topic, we unsubscribe from it
                                 if(m_parent == MQTTParentWidget::ImportFileWidget) {
                                     ui.twSubscriptions->setCurrentItem(children[j]);
                                     mqttUnsubscribe();
                                     --i;
                                 } else {
                                     QTreeWidgetItem* unsubscribeItem = children[j];
                                     while (unsubscribeItem->parent() != nullptr) {
                                         for (int i = 0; i < unsubscribeItem->parent()->childCount(); ++i) {
 											const QString& childText = unsubscribeItem->parent()->child(i)->text(0);
                                             if (unsubscribeItem->text(0) != childText) {
                                                 //add topic as subscription
 												quint8 qos = static_cast<quint8>(ui.cbQos->currentText().toUInt());
                                                 emit addBeforeRemoveSubscription(childText, qos);
                                                 //also add it to twSubscriptions
                                                 ui.twSubscriptions->addTopLevelItem(unsubscribeItem->parent()->takeChild(i));
                                                 --i;
                                             } else {
                                                 //before we remove the topic, we reparent it to the new subscription
                                                 //so no data is lost
                                                 emit reparentTopic(unsubscribeItem->text(0), name);
                                             }
                                         }
                                         unsubscribeItem = unsubscribeItem->parent();
                                     }
 
                                     qDebug()<<"Remove: "<<unsubscribeItem->text(0);
                                     emit removeMQTTSubscription(unsubscribeItem->text(0));
 
                                     ui.twSubscriptions->takeTopLevelItem(ui.twSubscriptions->indexOfTopLevelItem(unsubscribeItem));
                                 }
                             }
                         }
                     }
                 }
             }
 
 
             //implementalj es ird at liveDataDock addsubscription!!!!!
             manageCommonLevelSubscriptions();
             updateSubscriptionCompleter();
 
             emit enableWill(true);
         } else
             QMessageBox::warning(this, i18n("Warning"), i18n("You already subscribed to a topic containing this one"));
     } else
         QMessageBox::warning(this, i18n("Warning"), i18n("You already subscribed to this topic"));
 }
 
 /*!
  *\brief Updates the completer for leSubscriptions
  */
 void MQTTSubscriptionWidget::updateSubscriptionCompleter() {
     QStringList subscriptionList;
     for (int i = 0; i < ui.twSubscriptions->topLevelItemCount(); ++i)
         subscriptionList.append(ui.twSubscriptions->topLevelItem(i)->text(0));
 
     if (!subscriptionList.isEmpty()) {
         m_subscriptionCompleter = new QCompleter(subscriptionList, this);
         m_subscriptionCompleter->setCompletionMode(QCompleter::PopupCompletion);
         m_subscriptionCompleter->setCaseSensitivity(Qt::CaseSensitive);
         ui.leSubscriptions->setCompleter(m_subscriptionCompleter);
     } else
         ui.leSubscriptions->setCompleter(nullptr);
 }
 
 
 /*!
  *\brief called when the unsubscribe button is pressed
  * unsubscribes from the topic represented by the current item of twSubscription
  */
 void MQTTSubscriptionWidget::mqttUnsubscribe() {
     QTreeWidgetItem* unsubscribeItem = ui.twSubscriptions->currentItem();
     if (!unsubscribeItem)
         return; //should never happen
 
     QDEBUG("Unsubscribe from: " << unsubscribeItem->text(0));
     //if it is a top level item, meaning a topic that we really subscribed to(not one that belongs to a subscription)
     //we can simply unsubscribe from it
     if (unsubscribeItem->parent() == nullptr)
     {
         if(m_parent == MQTTParentWidget::ImportFileWidget)
             unsubscribeFromTopic(unsubscribeItem->text(0));
         else {
             emit removeMQTTSubscription(unsubscribeItem->text(0));
             ui.twSubscriptions->takeTopLevelItem(ui.twSubscriptions->indexOfTopLevelItem(unsubscribeItem));
         }
     }
 
     //otherwise we remove the selected item, but subscribe to every other topic, that was contained by
     //the selected item's parent subscription(top level item of twSubscriptions)
     else {
         while (unsubscribeItem->parent() != nullptr) {
             for (int i = 0; i < unsubscribeItem->parent()->childCount(); ++i) {
 				const QString& childText = unsubscribeItem->parent()->child(i)->text(0);
                 if (unsubscribeItem->text(0) != childText) {
 					quint8 qos = static_cast<quint8>(ui.cbQos->currentText().toUInt());
                     if(m_parent == MQTTParentWidget::ImportFileWidget)
                         emit makeSubscription(childText, qos);
                     else {
                         emit addBeforeRemoveSubscription(childText, qos);
                     }
 
                     ui.twSubscriptions->addTopLevelItem(unsubscribeItem->parent()->takeChild(i));
                     --i;
                 }
             }
             unsubscribeItem = unsubscribeItem->parent();
         }
 
         if(m_parent == MQTTParentWidget::ImportFileWidget)
             unsubscribeFromTopic(unsubscribeItem->text(0));
         else {
             emit removeMQTTSubscription(unsubscribeItem->text(0));
             ui.twSubscriptions->takeTopLevelItem(ui.twSubscriptions->indexOfTopLevelItem(unsubscribeItem));
         }
 
         //check if any common topics were subscribed, if possible merge them
         manageCommonLevelSubscriptions();
     }
     updateSubscriptionCompleter();
 
     if (ui.twSubscriptions->topLevelItemCount() <= 0)
         emit enableWill(false);
 }
 
 /*!
  *\brief called when a new topic is added to the tree(twTopics)
  * appends the topic's root to the topicList if it isn't in the list already
  * then sets the completer for leTopics
  */
 void MQTTSubscriptionWidget::setTopicCompleter(const QString& topic) {
     if (!m_searching) {
         const QStringList& list = topic.split('/', QString::SkipEmptyParts);
         QString tempTopic;
         if (!list.isEmpty())
             tempTopic = list.at(0);
         else
             tempTopic = topic;
 
         if (!m_topicList.contains(tempTopic)) {
             m_topicList.append(tempTopic);
             m_topicCompleter = new QCompleter(m_topicList, this);
             m_topicCompleter->setCompletionMode(QCompleter::PopupCompletion);
             m_topicCompleter->setCaseSensitivity(Qt::CaseSensitive);
             ui.leTopics->setCompleter(m_topicCompleter);
         }
     }
 }
 
 /*!
  *\brief called when leTopics' text is changed
  *		 if the rootName can be found in twTopics, then we scroll it to the top of the tree widget
  *
  * \param rootName the current text of leTopics
  */
 void MQTTSubscriptionWidget::scrollToTopicTreeItem(const QString& rootName) {
     m_searching = true;
     m_searchTimer->start();
 
     int topItemIdx = -1;
     for (int i = 0; i < ui.twTopics->topLevelItemCount(); ++i)
         if (ui.twTopics->topLevelItem(i)->text(0) == rootName) {
             topItemIdx = i;
             break;
         }
 
     if (topItemIdx >= 0)
         ui.twTopics->scrollToItem(ui.twTopics->topLevelItem(topItemIdx),
 								  QAbstractItemView::ScrollHint::PositionAtTop);
 }
 
 /*!
  *\brief called when leSubscriptions' text is changed
  *		 if the rootName can be found in twSubscriptions, then we scroll it to the top of the tree widget
  *
  * \param rootName the current text of leSubscriptions
  */
 void MQTTSubscriptionWidget::scrollToSubsriptionTreeItem(const QString& rootName) {
     int topItemIdx = -1;
     for (int i = 0; i < ui.twSubscriptions->topLevelItemCount(); ++i)
         if (ui.twSubscriptions->topLevelItem(i)->text(0) == rootName) {
             topItemIdx = i;
             break;
         }
 
     if (topItemIdx >= 0)
         ui.twSubscriptions->scrollToItem(ui.twSubscriptions->topLevelItem(topItemIdx),
 										 QAbstractItemView::ScrollHint::PositionAtTop);
 }
 
 /*!
  *\brief called when 10 seconds passed since the last time the user searched for a certain root in twTopics
  * enables updating the completer for le
  */
 void MQTTSubscriptionWidget::topicTimeout() {
     m_searching = false;
     m_searchTimer->stop();
 }
 
 void MQTTSubscriptionWidget::clearWidgets() {
     ui.twTopics->clear();
     ui.twSubscriptions->clear();
     ui.twTopics->headerItem()->setText(0, i18n("Available"));
 }
 
 void MQTTSubscriptionWidget::onDisconnect() {
     m_searchTimer->stop();
     m_searching = false;
     delete m_topicCompleter;
     delete m_subscriptionCompleter;
 }
 #endif
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