If an undo group is open, gets the group descriptor of the current top-level
undo group.
If no undo group is open, gets the group descriptor from the previous undo group.
Declaration Syntax
Remarks
The group descriptor can be used to join adjacent undo groups:
use a group descriptor to mark your changes, and on the second action,
compare LastGroupDescriptor and use StartContinuedUndoGroup(Object) if you
want to join the undo groups.
Assembly: ICSharpCode.AvalonEdit (Module: ICSharpCode.AvalonEdit.dll) Version: 5.0.0.4238