Re: undo got turned off

[Chong Yidong]

Dan Jacobson <address@hidden> writes:

> Gentlemen, how cruel of you to beep "undo-start: No undo information
> in this buffer". One never knew how much one uses undo until it is
> turned off. All one can do is save to a new file for the moment.
>
> Save the attached into file.html

Which file are you referring to?  I did

wget 
"http://radioscanningtw.jidanni.org/index.php?title=特殊:Recentchanges&hidemyself=1";
mv index.php[TAB] file.html
emacs -Q file.html

but I cannot reproduce your problem with this file: undo works fine.

BTW, please try to make your bug reports concise and precise;
muttering about "cruel" we are to turn off undo is cute, but makes it
hard to figure out the bug.

> then do emacs -Q file.html
> type a character, try to undo, and get a beep: undo has been turned off!
> (Also it is in sgml mode, not html(-helper) mode.)
>
> Probably the mixed charsets caused it. OK,
>   $ validate file.html
>   *** Errors validating file.html: ***
>   Error at line 6, character 164:  non SGML character number 137
>   Error at line 6, character 168:  non SGML character number 138
> But why turn off undo in revenge?
>
> Got an idea: how about a question in the minibuffer:
>    file.html is not in a familiar charset! Proceed? (y,n,q,?...)
> http://radioscanningtw.jidanni.org/index.php?title=特殊:Recentchanges&hidemyself=1
> http://www.google.com.tw/search?hl=zh-TW&ie=Big5&safe=off&q=FM56R-NFV2 
> linux&btnG= j M&meta=