I was working to implement your proposed solution - it seemed most logical to place overlay_prev_vec in the buffer struct, but placing the three necessary properties( overlay_prev_vec, noverlays_prev, prev_point_motion_hook ) in the structure caused the 'make' process to return a segfault. I'm going to look into this more in a few days, but do you have any idea why this would be happening, or another implementation strategy that wouldn't run into this problem? I followed the instructions about placing non-Lisp_Objects above the 'name' variable, so that is most likely not the issue.

The last few lines produced by running make were:

LC_ALL=C `/bin/pwd`/temacs -batch -l loadup dump
Segmentation fault
make: *** [emacs] Error 139

Thanks,
Nathaniel Flath

On Sat, Oct 17, 2009 at 9:09 PM, Stefan Monnier <monnier@iro.umontreal.ca> wrote:

> Any comments ont his?

I haven't had much time to look into it, but I wonder: what happens when
you switch buffer?

I get the impression that your code currently will consider
a buffer-switch as a kind of cursor movement to "very far away" (so it
will run the leave&enter hooks). I think it would be better to keep
track of overlay_prev_vec as a per-buffer (or probably better
per-window, tho that again introduces some questions when
a window-buffer is changed) information.

Stefan