D29759: wayland_server: Improve debug message, reduce duplicates

[Aleix Pol Gonzalez]

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

REVISION SUMMARY
  Demote the "interface not granted" message from a warning to debug
  and improve the wording a bit.
  We are listing all the interfaces, it's not like we're not granting an interface
  that the application wants, it's that we're not offering an interface to an application
  because it didn't opt in.
  Only report every miss once, to reduce the noise.

TEST PLAN
  ran kwin

REPOSITORY
  R108 KWin

BRANCH
  master

REVISION DETAIL
  https://phabricator.kde.org/D29759

AFFECTED FILES
  wayland_server.cpp

To: apol, #kwin
Cc: kwin, Orage, cacarry, LeGast00n, The-Feren-OS-Dev, cblack, jraleigh, zachus, fbampaloukas, 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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