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Using M8 on GTK. Accidentally performed Source->Format (java conventions) on a large, previously unformatted class (WorkbenchWindow). Two problems: 1. The operation, while taking a very long time, blocked the UI. 2. After it completed, I performed Edit->Undo and was surprised that the undo operation took about the same length of time (?) Perhaps performance can be improved under certain conditions if the the code formatter could consider copying the text before the format starts and implement undo as a text replace using the entire original text? (It is so slow to undo, I'm just guessing here that it is doing the inverse of the format, operation by operation)
Do you have comment formatting enabled? Best would be to attach your formatting profile.
Exactly the same report as Bug# 57495 - probably just submitted twice.
*** This bug has been marked as a duplicate of 57495 ***