bug#8996: Set PRIMARY from last selection, not last selected window

[Chong Yidong]

David De La Harpe Golden <david@harpegolden.net> writes:

> If such a postcommand-select-inhibit-list* defvar** was introduced and
> checked against instead of just hardcoding the two
> handle-select-window and handle-switch-frame, then whether or not you
> decide other-window also belongs on such a list by default, I could at
> least push other-window (and any other commands I encounter where it
> seems desirable) onto the list in my own ~/.emacs and reduce my local
> patching load...

OK, I've committed a variable selection-inhibit-update-commands.