support aboutToQuit application signal on exit

--add also shadows to tasks window thumbnails

app/lattecorona.cpp

@@ -111,8 +111,9 @@ Corona::Corona(bool defaultLayoutOnStartup, QString layoutNameOnStartUp, int use
       m_plasmaGeometries(new PlasmaExtended::ScreenGeometries(this)),
       m_dialogShadows(new PanelShadows(this, QStringLiteral("dialogs/background")))
 {
-    //! create the window manager
+    connect(qApp, &QApplication::aboutToQuit, this, &Corona::onAboutToQuit);
 
+    //! create the window manager
     if (KWindowSystem::isPlatformWayland()) {
         m_wm = new WindowSystem::WaylandInterface(this);
     } else {
@@ -162,7 +163,7 @@ Corona::Corona(bool defaultLayoutOnStartup, QString layoutNameOnStartUp, int use
 
 Corona::~Corona()
 {
-    m_inQuit = true;
+    /*m_inQuit = true;
 
     //! BEGIN: Give the time to slide-out views when closing
     m_layoutsManager->synchronizer()->hideAllViews();
@@ -175,7 +176,7 @@ Corona::~Corona()
     }
 
     qDebug() << "Latte Corona - unload: containments ...";
-    m_layoutsManager->unload();
+    m_layoutsManager->unload();*/
 
     m_plasmaGeometries->deleteLater();
     m_wm->deleteLater();
@@ -202,6 +203,24 @@ Corona::~Corona()
     }
 }
 
+void Corona::onAboutToQuit()
+{
+    m_inQuit = true;
+
+    //! BEGIN: Give the time to slide-out views when closing
+    m_layoutsManager->synchronizer()->hideAllViews();
+    m_viewSettingsFactory->deleteLater();
+
+    m_viewsScreenSyncTimer.stop();
+
+    if (m_layoutsManager->memoryUsage() == MemoryUsage::SingleLayout) {
+        cleanConfig();
+    }
+
+    qDebug() << "Latte Corona - unload: containments ...";
+    m_layoutsManager->unload();
+}
+
 void Corona::load()
 {
     if (m_activitiesConsumer && (m_activitiesConsumer->serviceStatus() == KActivities::Consumer::Running) && m_activitiesStarting) {

app/lattecorona.h

@@ -196,6 +196,8 @@ private slots:
     void alternativesVisibilityChanged(bool visible);
     void load();
 
+    void onAboutToQuit();
+
     void addOutput(QScreen *screen);
     void primaryOutputChanged();
     void screenRemoved(QScreen *screen);

containment/package/contents/ui/applet/AppletItem.qml

@@ -62,6 +62,7 @@ Item {
     readonly property bool canFillScreenEdge: communicator.requires.screenEdgeMarginSupported || communicator.indexerIsSupported
     readonly property bool canFillThickness: applet && applet.hasOwnProperty("constraintHints")
                                              && ((applet.constraintHints & PlasmaCore.Types.CanFillArea) === PlasmaCore.Types.CanFillArea);
+
     readonly property bool isMarginsAreaSeparator: applet && applet.hasOwnProperty("constraintHints")
                                                    && ((applet.constraintHints & PlasmaCore.Types.MarginAreasSeparator) === PlasmaCore.Types.MarginAreasSeparator);
 

plasmoid/package/contents/ui/previews/ToolTipInstance.qml

@@ -202,10 +202,22 @@ Column {
             Loader{
                 id:previewThumbLoader
                 anchors.fill: parent
-                anchors.margins: 2
+                anchors.margins: Math.max(2, previewShadow.radius)
                 active: LatteCore.WindowSystem.isPlatformX11 || (root.plasma520 && LatteCore.WindowSystem.isPlatformWayland)
                 visible: !albumArtImage.visible && !thumbnailSourceItem.isMinimized
                 source: root.plasma520 && LatteCore.WindowSystem.isPlatformWayland ? "PipeWireThumbnail.qml" : "PlasmaCoreThumbnail.qml"
+
+                DropShadow {
+                    id: previewShadow
+                    anchors.fill:  previewThumbLoader.item
+                    visible: previewThumbLoader.item.visible
+                    horizontalOffset: 0
+                    verticalOffset: Math.round(3 * PlasmaCore.Units.devicePixelRatio)
+                    radius: Math.round(8.0 * PlasmaCore.Units.devicePixelRatio)
+                    samples: Math.round(radius * 1.5)
+                    color: "Black"
+                    source: previewThumbLoader.item
+                }
             }
 
             ToolTipWindowMouseArea {