[bug] Extents not restored correctly by undo.

I'm editting an HTML::Mason component using "mmm-mode". The main mode is psgml's XML mode (xhtml), and there are Perl segments in there also. (mmm-mode is "multiple major mode mode") There are extents across the Perl segments... I started with something like: <% $perlvar %> ^^^^^^^^^^ Just this part is cperl mode. Then, with the cursor on the space between the first percent sign and the dollar sign, I used backspace to delete the percent sign, then typed an ampersand, then hopped over the $perlvar and did the similar with the other percent sign. (In Mason, this turned it from a perlvar interpolation into a component invocation...) The extent now looked like this: <& $perlvar &> ^^^^^^^^^^^^ All that in cperl mode now. When I used "undo" to back up to having percent signs instead of ampersands again, the extent that was in cperl mode stayed the same; IT WAS NOT ALSO UNDONE. That's a bug. Luckily, it's only a minor annoyance and not a total showstopper. <% $perlvar %> ^^^^^^^^^^^^ OOoops. -- mailto: (Karl M. Hegbloom) karlheg(a)microsharp.com http://www.microsharp.com phone://USA/WA/360-260-2066 jabber: karlheg(a)jabber.org