fix NOCOMPOSITING mode mask calculations

FIXED-IN:0.9.10
BUG:418456

containment/package/contents/ui/PanelBox.qml

@@ -460,11 +460,21 @@ Item{
                 if (!latteView)
                     return;
 
+                if (!Latte.WindowSystem.compositingActive) {
+                    //! NOCOMPOSITING mode is a special case and Effects Area is also used for
+                    //! different calculations for View::mask()
+                    var rootGeometry = mapToItem(root, 0, 0);
+                    efGeometry.x = rootGeometry.x;
+                    efGeometry.y = rootGeometry.y;
+                    efGeometry.width = width;
+                    efGeometry.height = height;
+                } else {
                     if (latteView.visibility.isHidden) {
-                    efGeometry.x = 0;
-                    efGeometry.y = 0;
-                    efGeometry.width = 0;
-                    efGeometry.height = 0;
+                        //! valid hide mask
+                        efGeometry.x = -1;
+                        efGeometry.y = -1;
+                        efGeometry.width = 1;
+                        efGeometry.height = 1;
                     } else {
                         if (!root.behaveAsPlasmaPanel) {
                             var rootGeometry = mapToItem(root, 0, 0);
@@ -478,6 +488,7 @@ Item{
                         efGeometry.width = width;
                         efGeometry.height = height;
                     }
+                }
 
                 latteView.effects.rect = efGeometry;