D26912: Use Qt5 signal syntax, format files, optimizations

[Méven Car]

meven requested changes to this revision.
meven added a comment.
This revision now requires changes to proceed.


  This kcms is going through some refactoring in D26934 <https://phabricator.kde.org/D26934> , not the greatest time for a mostly formatting PR.
  This will introduce a lot of conflict.

REPOSITORY
  R119 Plasma Desktop

REVISION DETAIL
  https://phabricator.kde.org/D26912

To: alex, mlaurent, davidedmundson, meven
Cc: meven, plasma-devel, Orage, LeGast00n, The-Feren-OS-Dev, jraleigh, zachus, fbampaloukas, GB_2, ragreen, ZrenBot, ngraham, alexeymin, himcesjf, lesliezhai, ali-mohamed, jensreuterberg, abetts, sebas, apol, ahiemstra, mart
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