Package: emacs
Version: 23.0.60
Severity: normal
Tags: patch

The select-active-regions in-tree does not work in all cases - it works
when the region is changed by moving the mark but not when it is changed
by certain other means e.g. moving the point with the keyboard.
(Workaround:  C-x C-x C-x C-x ...).

There were a couple of approaches tried a while back (see emacs-devel
"Improved X Selections" thread).  The idle timer seemed to work best in
practice, despite (or because of) "coarse graining" i.e. a bunch of
small region changes in a row don't reupdate the selection for each
change, only kicks in when emacs has idled.

Attached patch is a simple idle-timer based implementation.

Concerns here may also apply to the activate-mark-hook (which states
in its documentation that it is rerun when region changes). Having that
work similarly with the same method would probably mean that
active region timer would have to be enabled whenever the mark is
active, not just when select-active-regions is on.