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

Related to #1306

src/timeline2/view/qml/Clip.qml

@@ -255,6 +255,7 @@ Rectangle {
         onEntered: {
             dropData = drag.getDataAsString('kdenlive/effect')
             dropSource = drag.getDataAsString('kdenlive/effectsource')
+            updateDrag()
         }
         onDropped: {
             console.log("Add effect: ", dropData)
@@ -267,9 +268,11 @@ Rectangle {
             dropSource = ''
             dropRow = -1
             drag.acceptProposedAction
-            updateDrag()
             //console.log('KFR VIEW VISIBLE: ', effectRow.visible, ', SOURCE: ', effectRow.source, '\n HIDEVIEW:', clipRoot.hideClipViews<<', UNDEFINED: ', (clipRoot.keyframeModel == undefined))
         }
+        onExited: {
+            endDrag()
+        }
     }
     MouseArea {
         id: mouseArea

src/timeline2/view/qml/timeline.qml

@@ -1228,7 +1228,7 @@ 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
                     }