fix shortcut view disappear when long click on item #59
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Hi:
When I compile this launcher and pushed into my phone, I found the Shortcuts view often disappear when I long click on an item.
After reading the code, I think the root cause is because the DragController receive a TouchEvent with ACTION_MOVE type, and in its onTouchEvent callback call ShortcutsCreation.clearAllLayout().
Maybe this is only happening on my phone, but I think do some movement checking is helpful.