Justin (REAPER developer) just found out that mouswheel knob/fader movements don't add any UNDO points in REAPER at all. Bug in your plugins I guess?
A hint from Justin:
Well, I wasn't using mouse wheel - the bug is not in mousewheel adjustments. Moreover, mouse wheel changes are automated and Reaper does create undo for them in some cases.
I won't implement -1 as it is a bit pointless - you won't see what was changed beside faceless "non-automation state change". I myself do not think it is a good idea to move plug-in's undo to host, please do not persist on this feature. Having parallel undo histories is a much more pratical approach. When using Reaper's undo, if you wanted to revert changes made several minutes ago in another plug-in you'll also have to revert all other changes made, unrelated to that plug-in.
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