Reduce new_text_length appropriately when we run into the size limit for

Reduce new_text_length appropriately when we run into the size limit for

Wed May  2 20:36:38 2001  Owen Taylor  <otaylor@redhat.com>

	* gtk/gtkentry.c (gtk_entry_real_insert_text): Reduce
	new_text_length appropriately when we run into the
	size limit for the entry. (#53445, reported by Jeff Franks)

	* tests/testgtk.c (create_entry): Remove most of the
	property toggle buttons. Replace with a "Props" button
	that brings up a property editor.

	* tests/prop-editor.[ch] test/testtreeview.c tests/Makefile.am:
	Split the property editor code out for reuse, improve.