D26799: Apply KDE coding style, minor optimizations

[Alexander Lohnau]

alex marked an inline comment as done.
alex added inline comments.

INLINE COMMENTS

> meven wrote in filteredfoldermodel.cpp:38
> space ? I am not sure.

I am not sure too, because in the plasma-workspace project and even some qt files it is sometimes formatted like above but sometimes it is indented.

> meven wrote in kcm.cpp:72
> I did not know this formatting,, but I am not a specialist of kde policy.

Now it should fit the policy. KDE does not specify their own style for lambdas but uses the one of Qt: https://wiki.qt.io/Coding_Conventions .

REPOSITORY
  R119 Plasma Desktop

REVISION DETAIL
  https://phabricator.kde.org/D26799

To: alex, ngraham, meven
Cc: 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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