w3m-view-url-with-external-browser horrible user experience

[Leo Liu <sdl.web@xxxxxxxxx>]

It's been a long time since I last used emacs-w3m (more than a year) and
I am appalled by its current behaviour.

When I M-x w3m-view-url-with-external-browser, it displays for SECONDS

        Browsing <http://whatever.com/>...

leaving me in suspense when the GUI browser is popping to the front
stealing me away from emacs.

The sane behaviour should be like browse-url, where if GUI browser is
used open the url immediately so that users can M-TAB to switch back to
emacs.

HTH,
Leo