don't draw if label->layout is NULL due to a pending resize

don't draw if label->layout is NULL due to a pending resize

2001-01-09  Havoc Pennington  <hp@redhat.com>

	* gtk/gtklabel.c (gtk_label_expose): don't draw if label->layout
	is NULL due to a pending resize

	* gtk/gtktreeview.c (gtk_tree_view_check_dirty): don't set the
	column width to values less than 1

	* gtk/gtktreeviewcolumn.c (gtk_tree_view_column_set_width): clamp
	width to be between min/max width, and still set the width
	even if autosize is turned on, so the tree view can use this
	function in order to autosize.
	(gtk_tree_view_column_init): set initial width to 1 not 0

	* gtk/gtktreeview.c (gtk_tree_view_size_request_buttons): use
	setter function to modify column width, so we get notification
	(gtk_tree_view_insert_iter_height): ditto
	(gtk_tree_view_calc_size): ditto
	(gtk_tree_view_check_dirty): ditto

	* gtk/gtktreeviewcolumn.c (gtk_tree_view_column_class_init): Add
	properties to change all the interesting attributes of the tree
	view column.
	(gtk_tree_view_column_set_header_clickable): rename set_clickable
	(gtk_tree_view_column_get_clickable): add
	(gtk_tree_view_column_set_cell_renderer): don't unset the current
	attributes; assume a cell renderer with equivalent object
	properties has been swapped in. Do g_object_notify().
	(gtk_tree_view_column_set_visible): g_object_notify
	(gtk_tree_view_column_get_sizing): rename from get_col_type
	(gtk_tree_view_column_set_sizing): g_object_notify
	(gtk_tree_view_column_set_width): add g_object_notify
	(gtk_tree_view_column_set_min_width): ditto
	(gtk_tree_view_column_set_max_width): ditto
	(gtk_tree_view_column_set_title): ditto
	(gtk_tree_view_column_set_clickable): ditto
	(gtk_tree_view_column_set_widget): ditto
	(gtk_tree_view_column_set_justification): ditto