fix #262,dont hide preview window for buffer init

plasmoid/contents/ui/TaskDelegate.qml

@@ -653,7 +653,12 @@ MouseArea{
         ////window previews/////////
         if (isWindow) {
             if(containsMouse && root.showPreviews && Latte.WindowSystem.compositingActive){
-                hoveredTimerObj = hoveredTimerComponent.createObject(mainItemContainer);
+               // if (!windowsPreviewDlg.visible) {
+                    hoveredTimerObj = hoveredTimerComponent.createObject(mainItemContainer);
+               // } else {
+               //     mainItemContainer.preparePreviewWindow(false);
+               // }
+
                 //  preparePreviewWindow();
             }
             else{
@@ -1134,7 +1139,7 @@ MouseArea{
         Timer {
             id: hoveredTimer
 
-            interval: 2*root.durationTime*units.longDuration
+            interval: 600
 
             repeat: false
 

plasmoid/contents/ui/ToolTipInstance.qml

@@ -178,11 +178,23 @@ Column {
             // TODO: this causes XCB error message when being visible the first time
             property int winId: isWin && windows[flatIndex] != undefined ? windows[flatIndex] : 0
 
+            onWinIdChanged: {
+                if (winId !== previewThumb.prevWinId){
+                    previewThumb.visible = false;
+                    previewThumb.prevWinId = winId;
+                    previewThumb.visible = true;
+                }
+
+            }
+
             PlasmaCore.WindowThumbnail {
+                id: previewThumb
                 anchors.fill: parent
 
                 visible: !albumArtImage.visible && !thumbnailSourceItem.isMinimized
-                winId: thumbnailSourceItem.winId
+                winId: prevWinId //thumbnailSourceItem.winId
+
+                property int prevWinId: 0
 
                 ToolTipWindowMouseArea {
                     id: area2

plasmoid/contents/ui/main.qml

@@ -345,7 +345,7 @@ Item {
                 //console.log("preview show called: accepted...");
 
                 //used to initialize windows previews buffers from task to task
-                visible = false;
+                visible = true;
                 activeItem = taskItem;
                 toolTipDelegate.parentTask = taskItem;
 
@@ -355,29 +355,7 @@ Item {
                     signalSent = true;
                     //root.signalDraggingState(true);
                 }
-
-                //small delay to show in order to not mess up with the buffers clearing
-                //from previous visible:false
-                initializePreviewComponent.createObject(windowsPreviewDlg);
-            }
-        }
-    }
-
-    //A Timer to delay to show in order to not mess up with the buffers clearing
-    //from previous visible:false
-    Component {
-        id: initializePreviewComponent
-        Timer {
-            id: initializePreviewTimer
-            interval: 100
-            repeat: false
-
-            onTriggered: {
-                windowsPreviewDlg.visible = true;
-                initializePreviewTimer.destroy();
             }
-
-            Component.onCompleted: initializePreviewTimer.start()
         }
     }