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Drag and drop between Xwayland windows can drop onto a hidden window

It is possible for drag and drop to drop data on a window that is currently covered by a different window. To reproduce this:

  1. Open two text editor windows (such as Mousepad) using Xwayland.
  2. Cover one (but not the other) with a native Wayland window, such as weston-terminal.
  3. Drag and drop text from the uncovered one to where the covered one is.

This was copied from xorg/xserver#1650. @ofourdan wrote in xorg/xserver#1650 (comment 2317612) that this is most likely a Weston bug.

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