improve DragDrop behavior/responsiveness

containment/package/contents/ui/DragDropArea.qml

@@ -36,6 +36,8 @@ DragDrop.DropArea {
         property bool isSeparator: false
         property bool isLatteTasks: false
         property bool onlyLaunchers: false
+
+        property bool computationsAreValid: false
     }
 
     Connections{
@@ -65,9 +67,11 @@ DragDrop.DropArea {
     //! Give the time when an applet is dropped to be positioned properly
     Timer {
         id: clearInfoTimer
-        interval: 1500
+        interval: 100 //dragArea.isForeground ? 100 : 500
 
         onTriggered: {
+            dragArea.dragInfo.computationsAreValid = false;
+
             dragArea.dragInfo.isTask = false;
             dragArea.dragInfo.isPlasmoid = false;
             dragArea.dragInfo.isSeparator = false;
@@ -106,6 +110,7 @@ DragDrop.DropArea {
         dragInfo.isSeparator = isSeparator;
         dragInfo.isLatteTasks = isLatteTasks;
         dragInfo.onlyLaunchers = latteApplet ? latteApplet.launchersDrop(event) : false;
+        dragInfo.computationsAreValid = true;
 
         slotAnimationsNeedLength(1);
 
@@ -185,6 +190,11 @@ DragDrop.DropArea {
         }
 
         root.addLaunchersMessage = false;
+
+        if (!isForeground) {
+            dndSpacer.opacity = 0;
+            dndSpacer.parent = root;
+        }
     }
 
     onDrop: {

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

@@ -167,7 +167,7 @@ Item {
     property int oldY: y
 
     onXChanged: {
-        if (movingForResize || !root.dragInfo.entered) {
+        if (!foreDropArea.visible || movingForResize || !root.dragInfo.entered) {
             movingForResize = false;
             return;
         }
@@ -192,7 +192,7 @@ Item {
     }
 
     onYChanged: {
-        if (movingForResize || !root.dragInfo.entered) {
+        if (!foreDropArea.visible || movingForResize || !root.dragInfo.entered) {
             movingForResize = false;
             return;
         }

containment/package/contents/ui/main.qml

@@ -1723,6 +1723,9 @@ Item {
     DragDropArea {
         id: backDropArea
         anchors.fill: parent
+        readonly property bool higherPriority: latteView && latteView.containsDrag
+                                               && ((root.dragInfo.isPlasmoid && root.dragInfo.isSeparator)
+                                               || (foreDropArea.dragInfo.computationsAreValid && !root.dragInfo.isPlasmoid && !root.dragInfo.onlyLaunchers))
 
         Item{
             id: panelBox
@@ -1740,9 +1743,7 @@ Item {
         DragDropArea {
             id: foreDropArea
             anchors.fill: parent
-            visible: latteView && latteView.containsDrag
-                     && ((root.dragInfo.isPlasmoid && !root.dragInfo.isSeparator)
-                         || (root.addLaunchersInTaskManager && root.dragInfo.onlyLaunchers))
+            visible: !backDropArea.higherPriority
             isForeground: true
 
             /* Rectangle {

plasmoid/package/contents/ui/task/TaskItem.qml

@@ -571,7 +571,7 @@ MouseArea{
             root.separatorsUpdated();
 
             if (tasksExtendedManager.isLauncherToBeMoved(launcherUrl) && itemIndex>=0) {
-                parabolicManager.moveLauncherToCorrectPos(launcherUrl, itemIndex);
+                tasksExtendedManager.moveLauncherToCorrectPos(launcherUrl, itemIndex);
             }
         } else {
             root.separatorsUpdated();