delay hiding previews when creating contextmenu

-- there are cases that hiding previews too early
can create crashes under wayland. Such a case is
when the user uses the touchpad to emulate a right-click
event to create a context menu for specific task

BUG: 397635
FIXED-IN: 0.8.1

plasmoid/package/contents/ui/ContextMenu.qml

@@ -85,8 +85,12 @@ PlasmaComponents.ContextMenu {
         // backend.ungrabMouse(visualParent);
         openRelative();
 
-        windowsPreviewDlg.contextMenu = true;
-        windowsPreviewDlg.hide("8.2");
+        if (Latte.WindowSystem.isPlatformWayland){
+            //!Hiding previews under wayland it needs a delay otherwise it creates crashes
+            windowsPreviewCheckerToNotShowTimer.start();
+        } else {
+            windowsPreviewDlg.hide("9.4");
+        }
 
         icList.directRender = false;
 
@@ -276,7 +280,6 @@ PlasmaComponents.ContextMenu {
 
     Component.onDestruction: {
         if (!changingLayout) {
-            windowsPreviewDlg.contextMenu = false;
             root.contextMenu = null;
             backend.ungrabMouse(visualParent);
             root.signalActionsBlockHiding(-1);

plasmoid/package/contents/ui/main.qml

@@ -483,7 +483,6 @@ Item {
         mainItem: toolTipDelegate
         visible: false
 
-        property bool contextMenu: false
         property bool signalSent: false
         property Item activeItem: null
 
@@ -505,7 +504,7 @@ Item {
 
             windowsPreviewDlg.activeItem = null;
 
-            if (!contextMenu)
+            if (!root.contextMenu)
                 root.disableRestoreZoom = false;
 
             visible = false;
@@ -572,7 +571,7 @@ Item {
 
         onTriggered: {
             if (windowsPreviewDlg.visible && root.contextMenu) {
-                windowsPreviewDlg.hide();
+                windowsPreviewDlg.hide("8.2");
             }
         }
     }