On Wednesday, September 21, 2016 at 10:42:33 AM UTC+8, Robby Findler wrote:
> It is a performance issue and the default saves memory when one creates a lot
> of little text% objects.
>
>
> Maybe we should add something to the docs. Where did you look?
The overview section for editors could include a paragraph for enabling the
"undo" functionality, this is where I went when all else failed :-)
http://docs.racket-lang.org/gui/editor-overview.html?q=text%25
When I noticed that undo was not working, I searched the text% documentation
for the word undo, could not find any mention of enabling it. Also, what
confused me is that the documentation for the "add-undo" method
mentions:
The system automatically installs undo records to undo built-in editor
operations, such as inserts, deletes, and font changes. Install an
undoer only when it is necessary to maintain state or handle operations
that are not built-in.
I took that to mean that everything should work if I just manipulate the text
and don't add my own snips. Perhaps this paragraph could mention that the undo
limit is 0 by default and it should be set to a non-zero value using
`set-max-undo-history`.
Best Regards,
Alex.
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