D25022: Add some const &

[Albert Astals Cid]

aacid closed this revision.

REPOSITORY
  R108 KWin

REVISION DETAIL
  https://phabricator.kde.org/D25022

To: aacid, zzag
Cc: zzag, kwin, LeGast00n, The-Feren-OS-Dev, sbergeron, jraleigh, 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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