D28642: drm: Fix hotplugging docking stations

[Aleix Pol Gonzalez]

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

REVISION SUMMARY
  It turns out DRM connectors are not static and may change over time.
  This patch refreshes them right before looking for new outputs.
  
  BUG: 419061

TEST PLAN
  Seems to work better, it's still not ideal but I think there's an unrelated bug
  sending updates to clients.

REPOSITORY
  R108 KWin

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D28642

AFFECTED FILES
  plugins/platforms/drm/drm_backend.cpp
  plugins/platforms/drm/drm_backend.h

To: apol, #kwin
Cc: kwin, Orage, cacarry, 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
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