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(cherry-pick) applets/brightness: More robustness for surviving plugin destruction

Jakob Petsovits requested to merge work/cherry-pick-f501c908 into Plasma/6.2

Cherry-pick MR for !440 (merged).

Follow-up tweaks to further improve crash resistance when the brightness applet's plugin is torn down while updating its displays:

  • The scope guard, executed at the end of a display update loop, will now also check for aliveness to avoid writing to a member. Thanks to Anthony Fieroni for catching this.
  • The aliveness check for queryAndInsertDisplay() will now be performed after each call in the loop, instead of once at the outer while loop. More safety also for multi-monitor setups.

I'm pretty confident that this puts us at 100% coverage of aliveness checks after co_await.

(cherry picked from commit f501c908)

Co-authored-by: Jakob Petsovits jpetso@petsovits.com

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