Append theme path from resources

[dforsi]

Fixes issue #713.

Appending would allow local icons to take precedence over those bundled.

Calling QIcon::setThemeSearchPaths(themePaths); replaces the whole list of paths which results in missing icons on some systems. Adding qDebug() << QIcon::themeSearchPaths(); before and after the call to setThemeSearchPaths() before this patch:

2022-03-11T20:12:10.344 Debug: ("/home/user/.local/share/icons", "/usr/share/icons", "/var/lib/snapd/desktop/icons", ":/icons")
2022-03-11T20:12:10.344 Debug: (":/icons/welle_io_icons")

after this patch:

2022-03-11T20:14:59.384 Debug: ("/home/user/.local/share/icons", "/usr/share/icons", "/var/lib/snapd/desktop/icons", ":/icons")
2022-03-11T20:14:59.384 Debug: ("/home/user/.local/share/icons", "/usr/share/icons", "/var/lib/snapd/desktop/icons", ":/icons", ":/icons/welle_io_icons")

and all the icons are visible for me.

[tenzap]

any news on this please ?

[AlbrechtL]

Thanks for this fix!