Short-circuit the text to the exact same thing, so we don't unexpectedly

Short-circuit the text to the exact same thing, so we don't unexpectedly

Wed Mar 20 19:00:03 2002  Owen Taylor  <otaylor@redhat.com>

        * gtk/gtkentry.c (gtk_entry_set_text): Short-circuit
        the text to the exact same thing, so we don't
        unexpectedly change the selection or cursor position.
        (#74290, John Ellis.)