https://bugs.kde.org/show_bug.cgi?id=388647

--- Comment #11 from zccrs <[email protected]> ---
I'm sorry. Also need this commit of qtbase:
d7a9e08f0ada36ad8ad44651f27a76c9c74e3428

(In reply to zccrs from comment #10)
> Fix in Qt 5.9.0 and KWin 5.10.3
> 
> See qtbase: 2b34aefcf02f09253473b096eb4faffd3e62b5f4
> See KWin: a6dee74ee455d1da47dd5c9d55a84adbb5e1426a
> 
> The reason is that:
> When the screen is disconnected, The QDesktopWidget will to delete the
> QDesktopScreenWidget object corresponding to the screen, which will cause
> QXcbConnection::removeWindowEventListener to be called, and the event
> corresponding to the root window will no longer be processed by
> QXcbConnection.

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