Hi Al,

Sorry for the long delay in getting back to you on this.  I've been testing the 
feature on-and-off for a couple weeks now.  The issues I noted before are 
fixed, but I still often encounter cases where previews fail to generate or 
update.

One example involves abbrevs.  To reproduce, create an abbrev containing tex 
code (e.g., "dx" mapping to "$x$") and quickly type a couple abbrevs (e.g., "dx 
and dx" expanding to "$x$ and $x$").  Then I often get a preview for only the 
second formula.  If I keep typing, then both previews often fail to generate.

Here is something more deterministic.  Put point just before the closing $ of a 
generated preview, then do

  M-: (progn (save-excursion (end-of-line) (insert " ")) (insert "+1")).

The preview then fails to update.

I'm using the setup you recommended in our earlier exchange, e.g., 
preview-automatic-function is set to #'my/preview-automatic-math-region.

Any suggestions welcome.

Thanks, best,

Paul



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