source: tags/ms_r16q4/HELP_SOURCE/oldhelp/undo.hlp

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#************* Title of helpfile !! and start of real helpfile ********
TITLE           Undo/Redo

OCCURRENCE      ARB_NT ARB_EDIT4 ARB_SECEDIT

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}