D26511: [platforms/drm] Fix removing all outputs

[Roman Gilg]

romangg created this revision.
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REVISION SUMMARY
  Set outputs enablement also when none outputs are present. This patch is
  similar to earlier attempt at D17985 <https://phabricator.kde.org/D17985>.

TEST PLAN
  Manual disconnects and DPMS changes. There is still an issue when an output
  gets disconnected while the DPMS is off. But it's an improvement already.

REPOSITORY
  R108 KWin

BRANCH
  zero-output

REVISION DETAIL
  https://phabricator.kde.org/D26511

AFFECTED FILES
  plugins/platforms/drm/drm_backend.cpp

To: romangg, #kwin
Cc: kwin, LeGast00n, The-Feren-OS-Dev, sbergeron, 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
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