Fix timeline ruler not working after effect drop in some circumstances.

Related to #1306

src/timeline2/view/qml/Clip.qml

@@ -241,6 +241,7 @@ Rectangle {
         onEntered: {
             dropData = drag.getDataAsString('kdenlive/effect')
             dropSource = drag.getDataAsString('kdenlive/effectsource')
+            updateDrag()
         }
         onDropped: {
             console.log("Add effect: ", dropData)
@@ -252,7 +253,10 @@ Rectangle {
             }
             dropSource = ''
             dropRow = -1
-            drag.acceptProposedAction
+            drag.acceptProposedAction.
+        }
+        onExited: {
+            endDrag()
         }
     }
     MouseArea {

src/timeline2/view/qml/timeline.qml

@@ -1191,7 +1191,7 @@ Rectangle {
                         trimmingClickFrame = Math.round((scrollView.contentX + mouse.x) / timeline.scaleFactor)
                         timeline.requestStartTrimmingMode(mainClip.clipId, shiftPress)
                     }
-                    if (dragProxy.draggedItem > -1) {
+                    if (dragProxy.draggedItem > -1 && mouse.y > ruler.height) {
                         mouse.accepted = false
                         return
                     }