Detecting `undo` and `redo` from TextChanged

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Detecting `undo` and `redo` from TextChanged

Jason Felice
 
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('%')[1] doesn't seem to ever return the current change, as far as I can tell.

Thanks,
-Jason

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