fix NPE when showing differences for .model but there were no changes
Unaligned left vs right editors when (e.g. from history) one of the model has no title
Use current model in model diff tool if possible
Use current model in model diff tool if possible, allow custom persistence in diff tool
Finding rootId from .mpsr file,  not from filename
Merge remote-tracking branch 'origin/master' into 3.0/mikev/test
More graceful handling of java refactoring undo/redo
set roots under package folder
per-root model index
Merge branch '3.0/mikev/test'
make