[Permissions editor] Port icons to use QIcon::fromTheme()
Summary:
The permissions editor was using custom low-resolution pixmaps, which did not respect
the icon theme or color scheme and frequently just looked bad, including with a high
DPI screen or when using a dark theme.
This patch ports it to use icons from the active icon theme using QIcon::fromTheme().
BUG: 407662
FIXED-IN: 5.62
Test Plan:
All functionality still works.
Looks better, especially with Breeze icons, a dark color scheme, and a high DPI scale
factor:
Reviewers: Frameworks, cfeck, davidedmundson
Reviewed By: davidedmundson
Subscribers: davidedmundson, kde-frameworks-devel
Tags: Frameworks
Differential Revision: https://phabricator.kde.org/D22905