Improve icon/theme handling.
authorUwe Hermann <uwe@hermann-uwe.de>
Sun, 30 Apr 2017 20:44:33 +0000 (22:44 +0200)
committerUwe Hermann <uwe@hermann-uwe.de>
Fri, 5 May 2017 21:41:27 +0000 (23:41 +0200)
Only use QIcon::fromTheme() for icons which are included in the
freedesktop.org icon naming specification:

https://standards.freedesktop.org/icon-naming-spec/icon-naming-spec-latest.html

For all others there will be no icon to use from the theme and we always
want our own icons to be used unconditionally in those cases anyway.


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