Undo Begin and End block: no redo possible

[_Stevie_]

I noticed something strange with Undo Begin and EndBlock and wonder why no one else stumbled across this.

There are several issues with these functions:

- the undo name of the script is displayed in the undo list (next to the help menu), but when opening the undo history, there is no entry.

- executing redo for an undone script does not work at all


Is this a bug or expected behavior?

[heda]

I'm not sure what are you doing, but it shouldn't happen.
What do you need to store in the undo block? which extraflag parameter do you pass? -1 ?
I see they still have not included the extraflags documentation. schwa explained it in a recent pre release thread

[_Stevie_]

I'm using cfilion's script "Set item end to cursor and resize trailing MIDI notes" (ReaPack).

[_Stevie_]

bumpalicious

[tack]

I've noticed this with Reaticulate as well. There are times with wrapping a bunch of mutations in an undo block has no effect. For example this stanza:

https://github.com/jtackaberry/reati...p/app.lua#L208

That bit of code does a number of deletions and insertions of MIDI events, but it seems to fly under the radar of undo history. Like your screen capture, there's no trace of it and it can't be undone.

[tack]

BTW for future Googlers this is the thread heda referenced in which schwa describes the undocumented flags:

https://forum.cockos.com/showpost.ph...3&postcount=27

(I'm passing -1 in my case.)

[_Stevie_]

Thank you Tack for confirming! I was already thinking this is system specific.

[Meo-Ada Mespotine]

Thanks, added that info to my ReaScript-API-docs in the Reaper-Internals-thread.

[juliansader]

Originally Posted by _Stevie_

I noticed something strange with Undo Begin and EndBlock and wonder why no one else stumbled across this.

Others have also noticed it:

Undo_ in ReaScript issue... SOLVED

ReaScript: Undo_EndBlock with flags != -1 are not added to undo history

Can't get undo block working for reaper.MIDI_InsertNote

[tack]

Originally Posted by juliansader

Others have also noticed it

Awesome, very helpful, thanks Julian. I wasn't searching for the right things, clearly.

[_Stevie_]

I couldn’t find anything either, strange. And apparently this fact isn’t really widely spread!
Thanks Julian, have to put that in a sticky note!