[3.20.x] 452674: mark task editor parts dirty when their attributes change

This will cause the task editor's form to report that it's dirty, which
will make the isDirty check in AbstractTaskEditorPage.initModel() work.

Change-Id: I4686b1bea0a62bf346ea6dfbef1a27ba28455e55
Task-Url: https://bugs.eclipse.org/bugs/show_bug.cgi?id=452674
1 file changed