[Folder View] improve label contrast against challenging backgrounds

Authored by ngraham on Nov 24 2018, 5:15 AM.

Description

[Folder View] improve label contrast against challenging backgrounds

Summary:
Currently the shadow behind Folder View items' labels is very subtle. This leads to poor contrast against wallpapers that are light-colored, visually busy, or both.

This patch attempts to improve the situation by tightening up the shadow so that it looks more like a subtle, tasteful outline.

BUG: 361228
FIXED-IN: 5.12.8

Test Plan:
Folder View items against various wallpapers:

Folder View items against the default wallpaper:

Reviewers: Plasma, hein, VDG

Reviewed By: Plasma, hein

Subscribers: abetts, svenmauch, matheusm, filipf, emateli, mart, plasma-devel

Tags: Plasma

Differential Revision: https://phabricator.kde.org/D16968