D12517: Wayland: when blocking remember latest config change instead of crashing

[Roman Gilg]

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REVISION SUMMARY
  Configuration change requests by clients while the Wayland server is
  processing a change lead to a failing assert in blockSignals().
  
  Instead in such a situation remember the latest configuration change request
  and apply it after the current change has been processed.

TEST PLAN
  Auto test exposing the problem. Also manually with my output color correction
  code.

REPOSITORY
  R110 KScreen Library

BRANCH
  fixBlockingSignal

REVISION DETAIL
  https://phabricator.kde.org/D12517

AFFECTED FILES
  autotests/testkwaylandconfig.cpp
  backends/kwayland/waylandconfig.cpp
  backends/kwayland/waylandconfig.h
  tests/kwayland/waylandtestserver.cpp
  tests/kwayland/waylandtestserver.h

To: romangg, #plasma
Cc: plasma-devel, ragreen, Pitel, ZrenBot, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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