move edit ifs above _set_cursor code, don't collapse/expand row on double

move edit ifs above _set_cursor code, don't collapse/expand row on double

Sat Mar  2 03:49:31 2002  Kristian Rietveld  <kris@gtk.org>

        * gtk/gtktreeview.c (gtk_tree_view_button_press): move edit
        ifs above _set_cursor code, don't collapse/expand row on double
        click, only activate (#63269)
        (validate_visible_area): add two missing lines (#73161, #73162)