https://bugs.kde.org/show_bug.cgi?id=415903

            Bug ID: 415903
           Summary: Blocking compositing rule not reapplied when changing
                    window rules
           Product: kwin
           Version: unspecified
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: rules
          Assignee: kwin-bugs-n...@kde.org
          Reporter: k...@privat.broulik.de
  Target Milestone: ---

SUMMARY
When adding a window rule to block compositing for a specific window,
compositing does not turn off until the window is hidden and shown again.

STEPS TO REPRODUCE
1. Open some application window, e.g. Dolphin
2. In its window menu go to More Actions → Configure Special Window Settings
3. On the last tab (Appearance & Fixes) enable "Block compositing", "Apply",
"Yes"
4. Hit Apply

OBSERVED RESULT
Nothing happens

EXPECTED RESULT
Compositing is suspended right away

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 
(available in About System)
KDE Plasma Version: 5.17.80
KDE Frameworks Version: 5.56.0
Qt Version: 5.13.2

ADDITIONAL INFORMATION
Probably needs some form of `setBlockingCompositing(blockingCompositing())`
call in applyWindowRules() which is "Used e.g. after the rules have been
modified using the kcm."

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