Re: Undo manipulation

[Kevin Rodgers <ihs_4664@yahoo.com>]

Bill Wohler wrote:

> Kevin Rodgers <ihs_4664@yahoo.com> writes:
>>(let ((buffer-undo-list t))
>>   (insert "xyz\n"))
>>
> 
> Cool, thanks.
> 
> However, I was not pleased with the results in my case since the
> ignored manipulations occurred near the top and near the bottom of the
> buffer. So subsequent undos were very confused.
> 
> Here's a little more info. We have a radio button menu item that
> performs these actions I've described. Currently, the undo will undo
> the action stepwise, but the radio button will no longer represent
> reality. Ideally, an undo would undo the entire set of actions in one
> swoop, and set the radio button back to its previous setting. Is this
> possible?


I don't knw -- isn't that what the undo-boundary function is for?


> Otherwise, would it be better or worse for us to set buffer-undo-list
> to nil to prevent the radio button from getting out of sync?

I think that would cause the changes to be recorded, but only in the

temporary buffer-undo-list binding, which would be lost when the
let form returns.

-- 
Kevin Rodgers