Remove the assertions that x_offset and y_offset must be >= 0. Clip the

Remove the assertions that x_offset and y_offset must be >= 0. Clip the

2001-05-17  Joe Shaw  <joe@ximian.com>

	* gtk/gtktextdisplay.c (gtk_text_layout_draw): Remove the assertions
	that x_offset and y_offset must be >= 0. Clip the cursor being drawn
	if it is only partially onscreen.