KCM LookAndFeel check widgetStyle availability before applying it
Summary:
BUG: 419552
- Some Global Theme may refer to breeze widget style with a lower case b, apply the proper name Breeze
BUG: 418698
- Some Global Theme use widget style that may not be installed, then don't apply it.
Test Plan:
- Open KCM LookAndFeel, open GHNS and install Qogir-light theme, then apply it. Open Application Style KCM, if kvantum is not installed, Breeze is highlighted.
- Open KCM LookAndFeel, open GHNS and install Aritim-Light, then apply it. Open Application Style KCM, Breeze is highlighted.
Reviewers: Plasma, ervin, bport, meven, ngraham
Reviewed By: ervin, ngraham
Subscribers: ngraham, plasma-devel
Tags: Plasma
Differential Revision: https://phabricator.kde.org/D28662