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Currently the text edit infrastructure reads the text to replace in a undo from the document. This has the downside that in massive name changes (e.g. rename, move, ...) we heavily duplicate the string to undo.
Created attachment 20672 [details] A patch for a simple string sharing
Tom, can you please release this to org.eclipse.text. I will drop by.
released > 20050504
Closing as fixed.