[sup-talk] How hard would a universal undo be?

Rich Lane rlane at club.cc.cmu.edu
Sun Sep 13 17:40:05 EDT 2009


Excerpts from Nicolas Pouillard's message of Fri Sep 11 17:25:06 -0400 2009:
> On Fri, Sep 11, 2009 at 9:52 PM, Rich Lane<rlane at club.cc.cmu.edu> wrote:
> > Excerpts from Nicolas Pouillard's message of Fri Sep 11 05:16:49 -0400 2009:
> >> Excerpts from Rich Lane's message of Fri Sep 11 00:45:20 +0200 2009:
> >> > Excerpts from Carl Worth's message of Wed Sep 09 13:32:30 -0400 2009:
> >> > > Would it be a small change to move the undo keybinding to somewhere
> >> > > more universal?
> >> >
> >> > No :(
> >> >
> >> > > As a first cut, I'd be happy if it just undid the changes to the
> >> > > index, even without undoing any interface changes. That is, if my
> >> > > previous command was archive-thread-and-view-next-thread, it would be
> >> > > OK if it just undid the archiving part. Bonus points if it also undoes
> >> > > the view-next part, but I can imagine that being more work.
> >> >
> >> > I know I sound a bit like a broken record here, but immediate
> >> > label changes will solve this problem. Then, the undo system would just
> >> > need to keep a global stack of (msgid, previous_labels). I'm just hoping
> >> > somebody will volunteer for this - it will be a big patch.
> >>
> >> What prevent us from having a global stack of (msgid, previous_labels) in
> >> the actual settings?
> >
> > Hmm, you may be right. I was thinking that changes weren't propagated
> > between buffers except on save, but that's wrong because UpdateManager
> > is called in the keybinding. In that case, the user sees a mostly*
> > linear series of label changes, so it's safe to have a global undo
> > stack.
> 
> he next question is, what else is needed on this undo stack?
> 
> Are labels the only interaction we have? Here is what come to my mind:
> 
> * contacts (I more and more think that contacts should not be handled by
>   sup directly, but that's another topic)
> * drafts
> 

What actions on drafts are you thinking of making undoable? Could we
implement them with reserved labels?


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