D27904: Notify about decorations button order change

gikari created this revision.
Herald added a project: KWin.
Herald added a subscriber: kwin.
gikari requested review of this revision.

REVISION SUMMARY
  This allows GtkConfig daemon to properly sync decorations buttons order for GTK CSD applications.
  
  For 5.18.3

TEST PLAN
  1. Launch `kcmshell5 kwindecoration` and any GTK CSD app alongside
  2. Change order of the buttons.
  3. Window button order should be changed in GTK CSD app immediately (if `xsettingsd` is installed).

REPOSITORY
  R108 KWin

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D27904

AFFECTED FILES
  kcmkwin/kwindecoration/kwindecorationsettings.kcfgc

To: gikari
Cc: kwin, Orage, LeGast00n, The-Feren-OS-Dev, cblack, jraleigh, zachus, fbampaloukas, GB_2, mkulinski, ragreen, jackyalcine, iodelay, crozbo, bwowk, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, hardening, romangg, jensreuterberg, abetts, sebas, apol, ahiemstra, mart