[Folder View] Use an inactive highlight effect when something else has focus

Authored by ngraham on Nov 5 2019, 7:27 PM.

Description

[Folder View] Use an inactive highlight effect when something else has focus

Summary:
The theme SVG doesn't have a concept of "inactive selection highlight", so we need to
manufacture our own by reducing the opacity of the selection highlight.

Thanks to @broulik for suggesting the necessary code changes in the bug report.

FEATURE: 375501
FIXED-IN: 5.18.0

Test Plan:

Reviewers: Plasma, VDG, davidedmundson

Reviewed By: Plasma, davidedmundson

Subscribers: broulik, plasma-devel

Tags: Plasma

Differential Revision: https://phabricator.kde.org/D25160