buster%netscape.com ef5f3265cc added PlaceholderTxn. This is an aggregate transaction that sits on the undo stack ...

and merges in subsequent transactions indiscriminately until it's told to stop.
It also gives the last transaction in its child list a chance to merge the
next transaction.
All this is in support of complex transactions that result in text insertion
being able to collapse into a single undoable event.
Also improved tracking of bogus content node used when document is empty.


git-svn-id: svn://10.0.0.236/trunk@24151 18797224-902f-48f8-a5cc-f745e15eee43

1999-03-15 00:57:32 +00:00

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