https://bugs.kde.org/show_bug.cgi?id=403606

            Bug ID: 403606
           Summary: KWin freezes when opening multiple modal windows
           Product: kwin
           Version: 5.14.5
          Platform: Archlinux Packages
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: core
          Assignee: kwin-bugs-n...@kde.org
          Reporter: josereb...@outlook.com
  Target Milestone: ---

SUMMARY
The entire window manager becomes unresponsive when opening multiple modal
windows at the same time (for example, with qBittorrent, haven't tried to
reproduce with other programs).

STEPS TO REPRODUCE
1. Open qBittorrent
2. Click a magnet link on your web browser (a modal window opens)
3. Without closing the previous window, click a second magnet (a second modal
window opens)

OBSERVED RESULT
- Everything freezes, can't open application launcher / interact with windows
- Can open yakuake, for example, but its UI does not update
- Switch to other tty, pkill qbittorrent, switch back, everything goes back to
normal

EXPECTED RESULT
- Kwin not to freeze

SOFTWARE/OS VERSIONS
Arch Linux x64, updated
KDE Plasma Version: 5.14.5
KDE Frameworks Version: 5.54.0
Qt Version: 5.12.0

ADDITIONAL INFORMATION
Xorg, no DM (only xinit)

Apologies if this issue is in the wrong category / duplicated. I searched
around and did not find anything similar.

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