improvements for !compositing mode

--fixed struts gap for !compositing mode in order
to handle the strange kwin behavior. Kwin under
!compositing removes 1px. from the struts specified
by windows
--plenty of fixes concerning automatic coloring
under !compositing mode

app/wm/xwindowinterface.cpp

@@ -105,12 +105,17 @@ void XWindowInterface::setViewStruts(QWindow &view, const QRect &rect
     const QRect currentScreen {screen->geometry()};
     const QRect wholeScreen {{0, 0}, screen->virtualSize()};
 
+    //! WORKAROUND in order to fix KWin faulty behavior concerning struts
+    //! under !compositing mode. Under !compositing mode, kwin removes 1px.
+    //! from the struts
+    const int strutsGap = KWindowSystem::compositingActive ? 1 : 2;
+
     switch (location) {
         case Plasma::Types::TopEdge: {
             const int topOffset {screen->geometry().top()};
             strut.top_width = rect.height() + topOffset;
             strut.top_start = rect.x();
-            strut.top_end = rect.x() + rect.width() - 1;
+            strut.top_end = rect.x() + rect.width() - strutsGap;
             break;
         }
 
@@ -118,7 +123,7 @@ void XWindowInterface::setViewStruts(QWindow &view, const QRect &rect
             const int bottomOffset {wholeScreen.bottom() - currentScreen.bottom()};
             strut.bottom_width = rect.height() + bottomOffset;
             strut.bottom_start = rect.x();
-            strut.bottom_end = rect.x() + rect.width() - 1;
+            strut.bottom_end = rect.x() + rect.width() - strutsGap;
             break;
         }
 
@@ -126,7 +131,7 @@ void XWindowInterface::setViewStruts(QWindow &view, const QRect &rect
             const int leftOffset = {screen->geometry().left()};
             strut.left_width = rect.width() + leftOffset;
             strut.left_start = rect.y();
-            strut.left_end = rect.y() + rect.height() - 1;
+            strut.left_end = rect.y() + rect.height() - strutsGap;
             break;
         }
 
@@ -134,7 +139,7 @@ void XWindowInterface::setViewStruts(QWindow &view, const QRect &rect
             const int rightOffset = {wholeScreen.right() - currentScreen.right()};
             strut.right_width = rect.width() + rightOffset;
             strut.right_start = rect.y();
-            strut.right_end = rect.y() + rect.height() - 1;
+            strut.right_end = rect.y() + rect.height() - strutsGap;
             break;
         }
 

containment/package/contents/ui/VisibilityManager.qml

@@ -238,8 +238,7 @@ Item{
                || ((root.backgroundOnlyOnMaximized
                     || plasmoid.configuration.solidBackgroundForMaximized
                     || root.disablePanelShadowMaximized
-                    || root.windowColors !== Latte.Types.NoneWindowColors)
+                    || root.windowColors !== Latte.Types.NoneWindowColors))
-                   && Latte.WindowSystem.compositingActive)
     }
 
     Connections{

containment/package/contents/ui/colorizer/Manager.qml

@@ -116,7 +116,7 @@ Loader{
     readonly property color textColor: {
         if (latteView && latteView.managedLayout
                 && root.inConfigureAppletsMode
-                && !Latte.WindowSystem.compositingActive
+                && Latte.WindowSystem.compositingActive
                 && root.panelTransparency<40
                 && (root.themeColors === Latte.Types.SmartThemeColors)) {
             return latteView.managedLayout.textColor;
@@ -141,6 +141,10 @@ Loader{
 
     readonly property string scheme: {
         if (root.inConfigureAppletsMode && (root.themeColors === Latte.Types.SmartThemeColors)) {
+            if (!Latte.WindowSystem.compositingActive && applyTheme !== theme) {
+                return applyTheme.schemeFile;
+            }
+
             //! in edit mode (that is shown the edit visual without opacity)
             //! take care the applets that need a proper color scheme to paint themselves
             if ((editModeTextColorIsBright && themeExtended.isLightTheme)