pre-command-hook error with highlighted paren matching and searching

This bug report will be sent to the XEmacs Development Team, not to your local site managers!! Please write in English, because the XEmacs maintainers do not have translators to read other languages for them. In XEmacs 21.2 (beta43) "Terspichore" [Lucid] (i686-pc-linux, Mule) of Wed Feb 7 2001 on wanderer.hardakers.net configured using `configure --dynamic --without-toolbars --without-dialogs --with-pop --error-checking=none --with-modules --with-mule' Please describe exactly what actions triggered the bug and the precise symptoms of the bug: It's taken me forever to figure out exactly what key strokes I hit to reproduce this. Basically, it comes down to this: Turn one paren highlighting: (require 'paren) (paren-set-mode 'sexp) Then, do a search (C-s) for something that doesn't exist (say, "xyzzy"). Hit return, escape or c-g (ie, stop the search). Then hit C-s again, followed by C-s to repeat the last search. Now, hit C-a (beginning of line) and you'll get the following back trace: Signaling: (wrong-type-argument integer-or-marker-p nil) goto-char(nil) (progn (goto-char (cdr isearch-region)) (push-mark (car isearch-region) nil t)) (and isearch-region (progn (goto-char ...) (push-mark ... nil t))) (unwind-protect (and isearch-region (progn ... ...)) (setq isearch-region nil) (remove-hook (quote pre-command-hook) (quote isearch-pre-pre-command-hook))) isearch-activate-region-on-exit() run-hooks(isearch-activate-region-on-exit) isearch-done() isearch-pre-command-hook() Wheeeee... Now, to make matters worse, the paren highlinghting matching is broken and in a way that it highlights new paren groups, but fails to unhighlight them after you move the cursor away from the matching parens. Recent keystrokes: C-x C-s C-s C-s C-g C-g C-n C-n C-x C-f v a c TAB c RET C-s < < < C-a C-g C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-n C-p C-x 1 C-SPC C-n C-n C-n C-n C-n C-w C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-p C-SPC C-n C-w C-x C-s C-x 4 b RET C-x o C-s C-s C-a f8 C-s C-s C-a C-g C-g C-s C-s C-g C-g f8 C-s C-s C-s C-g C-g C-g C-g C-g C-s C-s C-a C-g C-g C-g f8 misc-user Recent messages (most recent first): Welcome to flyspell. Use M-tab or Mouse-2 to correct words. Welcome to flyspell. Use M-tab or Mouse-2 to correct words. Loading emacsbug...done Loading emacsbug... Paren mode is sexp Paren mode is OFF Quit Quit Quit Quit -- "Ninjas aren't dangerous. They're more afraid of you than you are of them."