Fixed escape key press detection

src/FloatingDragPreview.cpp

@@ -206,6 +206,11 @@ CFloatingDragPreview::CFloatingDragPreview(QWidget* Content, QWidget* parent) :
 
 	connect(qApp, SIGNAL(applicationStateChanged(Qt::ApplicationState)),
 		SLOT(onApplicationStateChanged(Qt::ApplicationState)));
+
+	// The focused object will receive key press events and therefore we
+	// install the event filter on it to receive escape key press for drag
+	// canceling
+	qApp->focusObject()->installEventFilter(this);
 }
 
 
@@ -220,10 +225,6 @@ CFloatingDragPreview::CFloatingDragPreview(CDockWidget* Content)
 		d->ContenSourceContainer = Content->dockContainer();
 	}
 	setWindowTitle(Content->windowTitle());
-
-	// We need to install an event filter for the given Content
-	// widget to receive the escape key press
-	Content->dockAreaWidget()->installEventFilter(this);
 }
 
 
@@ -235,10 +236,6 @@ CFloatingDragPreview::CFloatingDragPreview(CDockAreaWidget* Content)
 	d->ContentSourceArea = Content;
 	d->ContenSourceContainer = Content->dockContainer();
 	setWindowTitle(Content->currentDockWidget()->windowTitle());
-
-	// We need to install an event filter for the given Content
-	// widget to receive the escape key press
-	Content->installEventFilter(this);
 }
 
 
@@ -395,7 +392,6 @@ bool CFloatingDragPreview::eventFilter(QObject *watched, QEvent *event)
 
 
 
-
 } // namespace ads
 
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