Bug 504087 - make gtk_tooltip_set_custom a no-op for setting the current

Bug 504087 - make gtk_tooltip_set_custom a no-op for setting the current

2008-05-28  Kristian Rietveld  <kris@imendio.com>

	Bug 504087 - make gtk_tooltip_set_custom a no-op for setting the
	current widget again.

	* gtk/gtktooltip.c (gtk_tooltip_set_custom),
	(gtk_tooltip_reset), (gtk_tooltip_run_requery): use a
	custom_was_reset field to check if the custom widget is set again in
	the query-tooltip callback; if not, we set it to NULL.  Based on a
	patch by Xavier Claessens, insightful comments from Jean-Yves Lefort
	and Christian Persch.

svn path=/trunk/; revision=20215