PaletteWidget: Do not use autoconnection mechanism for slots used in

QMenu

Currently whenever UI gets loaded and we try to connect a slot with a
signal emitted in QAction, for example in appending frame, inserting it,
etc. we get warnings like these:

qt.core.qmetaobject.connectslotsbyname: QMetaObject::connectSlotsByName: No matching signal for on_actionAdd_Frame_triggered()

This is because MOC tries to automatically connect functions which have
"on_objectname_triggered" signature, and it can't find a matching signal
for it by default. So the solution for that is to simply not use the
autoconnection mechanism by changing names of those slots, removing
"on" prefix from them.

source/palettewidget.cpp

@@ -505,12 +505,12 @@ void PaletteWidget::ShowContextMenu(const QPoint &pos)
     contextMenu.setToolTipsVisible(true);
 
     QAction action0("Undo", this);
-    QObject::connect(&action0, SIGNAL(triggered()), this, SLOT(on_actionUndo_triggered()));
+    QObject::connect(&action0, SIGNAL(triggered()), this, SLOT(actionUndo_triggered()));
     action0.setEnabled(this->undoStack->canUndo());
     contextMenu.addAction(&action0);
 
     QAction action1("Redo", this);
-    QObject::connect(&action1, SIGNAL(triggered()), this, SLOT(on_actionRedo_triggered()));
+    QObject::connect(&action1, SIGNAL(triggered()), this, SLOT(actionRedo_triggered()));
     action1.setEnabled(this->undoStack->canRedo());
     contextMenu.addAction(&action1);
 
@@ -801,12 +801,12 @@ void PaletteWidget::on_closePushButtonClicked()
     ((MainWindow *)this->window())->paletteWidget_callback(this, PWIDGET_CALLBACK_TYPE::PWIDGET_CALLBACK_CLOSE);
 }
 
-void PaletteWidget::on_actionUndo_triggered()
+void PaletteWidget::actionUndo_triggered()
 {
     this->undoStack->undo();
 }
 
-void PaletteWidget::on_actionRedo_triggered()
+void PaletteWidget::actionRedo_triggered()
 {
     this->undoStack->redo();
 }

source/palettewidget.h

@@ -200,8 +200,8 @@ private slots:
     void on_saveAsPushButtonClicked();
     void on_closePushButtonClicked();
 
-    void on_actionUndo_triggered();
-    void on_actionRedo_triggered();
+    void actionUndo_triggered();
+    void actionRedo_triggered();
 
     void on_pathComboBox_activated(int index);
     void on_displayComboBox_activated(int index);