D23435: Emit mode-change on all relevant changes

romangg created this revision.
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REVISION SUMMARY
  The EGL GBM backend must be informed about mode changes so that the surface
  gets reset. This fixes mode changes for me. Rotations still not work, this
  needs some more structure cleanup.

TEST PLAN
  Manually changed resolution and scale alone and together with KScreen.

REPOSITORY
  R108 KWin

BRANCH
  emitModeChange

REVISION DETAIL
  https://phabricator.kde.org/D23435

AFFECTED FILES
  abstract_wayland_output.cpp

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