[KDE/Mac] plasma-desktop on other environments (bis)

[René J. V. Bertin]

I've added a few (4) more screenshots to the RR 
(https://git.reviewboard.kde.org/r/126198/), showing a pure stock KF5-on-OS-X 
look and feel vs. one provided by my platform theme plugin with its default 
settings (i.e. without ~/.config/kdeglobals).

The behaviour of 2 of the KCMs in absence of a ~/.config/kdeglobals surprises me 
a bit. The "application style" KCM doesn't show the active style nor the style 
name that the platform plugin would return, but the Breeze style instead.
The fonts KCM also doesn't list the fonts from the DefaultFontData table in 
kfontsettingsdata but rather what seems to be a hardcoded list of typefaces.

Is that correct (I haven't yet had the occasion to figure out exactly what the 
code does, sorry for that)?
Would it be possible (and wouldn't it be preferable) to initialise these items 
with the actual defaults provided by the plugin (or else by Qt)?

R.