D9114: [Breeze window decoration] Don't repaint title bar if not damaged

[Kai Uwe Broulik]

broulik created this revision.
broulik added reviewers: Plasma, hpereiradacosta, graesslin.
Restricted Application added a project: Plasma.
Restricted Application added a subscriber: plasma-devel.

TEST PLAN
  Resized my windows with super large border size, painted properly. Did not repaint the title bar as often as it used to.

REPOSITORY
  R31 Breeze

REVISION DETAIL
  https://phabricator.kde.org/D9114

AFFECTED FILES
  kdecoration/breezedecoration.cpp

To: broulik, #plasma, hpereiradacosta, graesslin
Cc: plasma-devel, ZrenBot, progwolff, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, mart
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