#FEATURE by cg
class: WindowGroup
class definition
added: #modalDialogStarts:
removed: #modalDialogStarts
comment/format in:
#documentation
#isForModalSubview
#isForModalSubview:
#isInModalLoop
changed:
#modalDialogFinished
#startupModal:forGroup:
not only keep the info that there is a modal window group,
but also remember the modal group.
This is useful info for the process monitor and the debugger.