IDEA-94950 Code Style | Arrangement: AIOOBE at ArrangementMatchingRulesModel.removeRow() on removing the last rule that is in edit mode
dead code
IDEA-112040 Customize Data Views control confused about data object's class
Merge remote-tracking branch 'origin/master'
IDEA-82840 "test" button added to mercurial config panel

*test button added;
*unsupported extensions moved to HgVersion class
extensions: collection-based sort API
CR-IC-3920 (postpone class loading until extensions requested)