bug#28146: 25.1; Timeout waiting for property notify event when select-active-regions is t

[Eli Zaretskii]

> From: Brady Garvin <bgarvin@acm.org>
> Date: Sat, 19 Aug 2017 10:03:19 -0500
> 
> 1. Start Emacs (under X):
>     $ emacs -Q
> 2. Type M-x 1 0 0 0 0 0 0 RET C-SPC M-<
> 
> Expected behavior: The region encompasses the entire scratch buffer,
> including the million new blank lines, and the region is highlighted.
> 
> Actual behavior: Emacs hangs for a few moments and then reports "Timed
> out waiting for property-notify event".  Subsequently, the region is
> correct and correctly highlighted.  (The entire actual behavior,
> however, is correct when select-active-regions is nil.)

This problem and its possible workaround are described in
etc/PROBLEMS; search for "Timed out waiting for property-notify
event".

See also bug#24013, which led to that entry in PROBLEMS.