When double clicking a title clip, seek to click pos before editing title to...

When double clicking a title clip, seek to click pos before editing title to show correct background.
Related to #994

src/timeline2/view/timelinecontroller.cpp

@@ -3180,6 +3180,7 @@ void TimelineController::editTitleClip(int id)
         pCore->displayMessage(i18n("Item is not a title clip"), ErrorMessage, 500);
         return;
     }
+    seekToMouse();
     pCore->bin()->showTitleWidget(binClip);
 }