IconBorder: Accept drag&drop events
Summary:
..and forward them to KateViewInternal. This way is dropping text to
column 1 of the view much less cumbersome
BUG: 405280
FIXED-IN: 5.57
Reviewers: KTextEditor, dhaumann
Reviewed By: KTextEditor, dhaumann
Subscribers: dhaumann, kwrite-devel, kde-frameworks-devel, KTextEditor
Tags: Kate, Frameworks
Differential Revision: https://phabricator.kde.org/D19681