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# format described in ../help.readme


TITLE		Undo/Redo

OCCURRENCE	ARB wide 

DESCRIPTION	The undo/redo feature works on your database.
		This means it will only affect actions which change the database.
		We cannot give you a detailed list of what affects the
		database (DB) and what does not - just a few examples:

		- changing tree or sequence data affects DB
		  (you've guessed that!)
		- changing the cursor position in ARB_EDIT4 does not affect DB
		- changing dialogs does _sometimes_ affect DB (this depends
		  on whether the value is save in properties or in the DB).

		Note that there is only _one_ undo/redo queue for all applications
		together, cause they all work on the same DB!
		If you e.g. change a tree in ARB and then change a sequence
		in ARB_EDIT4 you cannot undo your tree change by clicking UNDO in
		ARB, which would on the contrary undo your sequence change because
		it was your last DB-change.
		
		After undo-ing something be careful: If you change anything (that
		affects the DB) your current redo-list will be deleted - this
		means you can no longer redo your undos!

NOTES		The undo-depth depends on memory usage.	

EXAMPLES	None

WARNINGS	None

BUGS		Undo crashes when "deleting a group" is undone (and in similar cases).
		See LINK{http://bugs.arb-home.de/ticket/496}
