bug#33784: 27.0.50; some case c-backward-token-2 takes cpu more and emacs hang

[Alan Mackenzie]

Hello, Eli.

On Tue, Dec 18, 2018 at 20:51:48 +0200, Eli Zaretskii wrote:
> > Date: 18 Dec 2018 17:47:16 -0000
> > From: Alan Mackenzie <acm@muc.de>
> > Cc: 33784@debbugs.gnu.org

> > Incidentally, the temporary buffer created by with-temp-buffer never has
> > font-lock-mode enabled, and font-lock-mode is spiked so that it cannot
> > be enabled in such a buffer.  I don't know why.  Attempting to enable it
> > fails silently, which is probably another bug.

> It's not a bug, since the temporary buffer starts in Fundamental mode.

If fails silently even after M-: c++-mode in that buffer.

The current strategy is silently to ignore (font-lock-mode) when the
buffer name begins with a space.  It feels to me like an easy to
implement, but suboptimal, workaround to a real problem, whatever that
real problem might be.

-- 
Alan Mackenzie (Nuremberg, Germany).