fix shortcut view disappear when long click on item

[RuiwenTang]

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.

[RuiwenTang]

Hi,
I cannot build this source code after I download from Github because this source lack some source files.
Could you send me a full source code?
Thank you

you can refer the commits in branch self_dev of my forked project