The plugin I'm working on updates the buffer after every change and uses :undojoin. Unfortunately, sometimes the change *is* an undo, in which case, :undojoin kills the history. What's the best way to detect whether the operation is an undo or redo for this purpose?
The only thoughts I have are to nmap u and <C-r> (ick), or to somehow check the number returned by getchangelist()... although I getchangelist('%') doesn't seem to ever return the current change, as far as I can tell.
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