Diego Gangl authored Jun 08, 2018 and Matthieu Gallien committed Jun 21, 2018

Summary:
This patch hides the rating widget when the rating is 0 stars to reduce visual clutter.
There are two cases with different behaviour:

- When a rating widget is read-only, only ratings with more than zero stars are  visible
- When a rating widget isn't read-only, the same rule applies but it also becomes visible on hover or selection (works like the play/delete/enqueue buttons). This way users can still set ratings on tracks with no stars.

{F5857090}

Test Plan: Set readOnly in RatingStar.qml to false to test the hover effect

Reviewers: #elisa, mgallien

Reviewed By: #elisa, mgallien

Subscribers: mgallien, astippich

Tags: #elisa

Differential Revision: https://phabricator.kde.org/D12975