bug#16910: 24.3; c++ mode: autoindent stops working

[Eli Zaretskii]

> From: admin@practicealgebra.net
> Date: Fri, 28 Feb 2014 11:26:22 -0500
> 
> While editing files in c++ mode, autoindent sometimes stops working
> after a while. Saving, making a trivial change and then immediately
> reverting sometimes solves the problem, but usually not. I'm afraid I
> can't give a recipe, since I myself don't understand when it happens; it
> seems unpredictable. But (some of) the error messages from emacs (which
> appear in the echo area) are below.

When this happens to me (and it does, although there are no messages I
could spot in my cases), I usually save and kill the buffer, then
visit the file anew -- the problems are usually gone after that.