bug#34525: replace-regexp missing some matches

[Eli Zaretskii]

> From: Daniel Lopez <daniel.lopez999@gmail.com>
> Date: Mon, 18 Feb 2019 08:28:35 +0000
> 
> - Start "emacs -Q" and open the file BitmapFontFace.h
> - Evaluate the expression (replace-regexp "\\<Bitmap\\>" "SharedBitmap")
> - The text "Replaced 8 occurrences" appears in the echo area.
> 
> Problem:
> 
> There were actually 12 occurrences (ie. of the word "Bitmap" surrounded 
> by word boundaries) in the file that should have been replaced. If I now 
> move point back to the start of the buffer and evaluate the expression 
> again, it says "Replaced 4 occurrences".
> 
> The exact number of incorrect replacements perhaps varies over time. 
> That is, I can test it five times in a row and get 8 initial replacments 
> each time, but after trying some other search terms, messing with the 
> file, restarting Emacs etc, I try my initial test again and then maybe 
> it consistently replaces 10 the first time, for a while. So your exact 
> numbers may vary.

C++ Mode plays some funky games with the syntax of '<', so maybe this
is the consequence.  CC'ing Alan, in the hope that he might have
something interesting to say about this.

Thanks.