block the text_layout's "changed" handler when changing cursor visibility

block the text_layout's "changed" handler when changing cursor visibility

2005-05-25  Michael Natterer  <mitch@imendio.com>

	* gtk/gtktextview.c (blink_cb): block the text_layout's "changed"
	handler when changing cursor visibility because it would expose
	the whole paragraph where the cursor is. Instead, expose the
	cursors' areas manually. (#173047).

	(text_window_invalidate_cursors): new function which exposes the
	cursors.

	* gtk/gtkstyle.c (draw_insertion_cursor): added comment that the
	same cursor size calculation is in text_window_invalidate_cursors().