* gdesktop.c (dnd_select_icon_pending): Added this flag that
specifies whether a selection is pending for an icon if the user
was holding the Control key down while clicking. We have to delay
selection in this case so that DnD will work correctly, just like
Windows.
(icon_button_press): New function that handles button presses on
icons; it obsoletes the old desktop_icon_info_event().
(icon_button_release): New function that handles button releases
on desktop icons; it will do what is appropriate if there was a
pending icon selection.
(drag_begin): Handle pending selections as appropriate.
(unselect_all): Added an paremeter that specifies which icon to
exclude from unselection.
(editing_started): Unselect all icons but the one for which
editing has started.
(dnd_icon_sources): Changed the MIME-types for internal drops to
"application/x-mc-desktop-icon".
(click_proxy_window): New variable that stores the proxy window
for clicks on the desktop.
(setup_desktop_clicks): New function that sets up clicks on the
root window.
(find_click_proxy_window): New function to find and set up the
window for proxying clicks from the root window.
* image.metadata.in: Added case for `jpg', as there was only a
case for `jpeg'.
