KDevelop 5 : Fix HiDPI issue with project tree view
Summary:
Made ::paint(...) member function work more like QT5.5's QItemDelegate::paint(...)
Specifically, draws QIcon instead of Pixmap when appropriate.
Refs T664
Test Plan:
Project view's decorations should be in same place in HiDPI mode.
Tested on OSX:
Reviewers: kfunk, mwolff
Reviewed By: mwolff
Subscribers: andric, mwolff, kdevelop-devel
Projects: KDevelop
Maniphest Tasks: T664
Differential Revision: https://phabricator.kde.org/D434