https://bugs.kde.org/show_bug.cgi?id=429930

            Bug ID: 429930
           Summary: Mouse scroll doesn't work when Alt+Tab to XWayland
                    windows
           Product: frameworks-kwayland
           Version: unspecified
          Platform: Compiled Sources
                OS: Linux
            Status: REPORTED
          Severity: major
          Priority: NOR
         Component: server
          Assignee: mgraess...@kde.org
          Reporter: butir...@gmail.com
                CC: kwin-bugs-n...@kde.org
  Target Milestone: ---

SUMMARY
Different X apps in Wayland session start behave strange when Alt+Tab to them -
mostly, mouse scroll doesn't work properly.
To make it work, Esc or any other key press is enough.
It seems Alt release event doesn't occur on Alt+Tab switch to XWayland windows.

Sample apps suffered: FF, Qt Creator.

STEPS TO REPRODUCE
switch with Alt+Tab from any Wayland window to FF X window and try to mouse
scroll there

OBSERVED RESULT
Scrolling doesn't work.
Instead, if browsing history is present for the tab, it will go back/forth by
pages in the history on mouse wheel rotation.

EXPECTED RESULT
Scrolling works as usual.

SOFTWARE/OS VERSIONS
compiled from master

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