D10296: Make it possible to compile 5.12 branch with a kdecoration from master

[Martin Flöser]

graesslin created this revision.
graesslin added reviewers: KWin, Plasma.
Restricted Application added a project: KWin.
Restricted Application added subscribers: kwin, plasma-devel.
graesslin requested review of this revision.
Restricted Application edited projects, added Plasma; removed KWin.

REVISION SUMMARY
  KDecoration has two new pure virtual methods. Due to that one cannot
  build KWin in the stable branch. This makes bug fixing rather cumbersome
  as one also needs to switch the kdecoration branch.
  
  This rather unusual change for a stable branch improves the
  compatibility by adding the new virtual methods without doing anything
  and without marking them as override, so that the code can compile with
  a kdecoration from 5.12 and a kdecoration from master.

TEST PLAN
  5.12 branch compiles with kdecoration master branch

REPOSITORY
  R108 KWin

BRANCH
  compile-5.12-with-kdecoration-master

REVISION DETAIL
  https://phabricator.kde.org/D10296

AFFECTED FILES
  decorations/decoratedclient.cpp
  decorations/decoratedclient.h
  kcmkwin/kwindecoration/declarative-plugin/previewclient.cpp
  kcmkwin/kwindecoration/declarative-plugin/previewclient.h

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