Show icons in icon border context menu
Summary:
- if icons are defined for marks, use them in the context menu
- more general approach than D7158
Test Plan: - right click icon border to open context menu
Reviewers: KTextEditor, dhaumann
Reviewed By: KTextEditor, dhaumann
Subscribers: dhaumann, kfunk, kwrite-devel, Frameworks
Tags: Frameworks
Differential Revision: https://phabricator.kde.org/D7458