2006-02-26  Zbigniew Chyla  <mail@zbigniew.chyla.pl>

	Avoid heavy operations inside "motion_notify_event" handler: don't
	call gtk_tree_model_row_changed (which causes updating the whole
	view), don't create new mouse cursor, change cursor only when
	necessary.
	As a bonus we avoid leaking hand cursor in nautilus and X server.

	* src/file-manager/fm-list-view.c:
	(hand_cursor): new global variable for storing hand cursor used in
	single click mode
	(motion_notify_callback): don't call gtk_tree_model_row_changed on
	the model when changing rows, it's very slow and unnecessary - GTK+
	automatically invalidates parts of the view occupied by old and new
	row; don't leak the hand cursor (GdkCursor), change mouse cursor
	only when necessary (from GDK_HAND2 to default and the other way
	round)
	(leave_notify_callback): don't call gtk_tree_model_row_changed on
	the current row in the model, GTK+ automatically redraws the current
	row
	(enter_notify_callback): in case single click mode is used, update
	details->hover_path and set hand cursor if necessary
	(create_and_set_up_tree_view): connect to enter_notify_event signal
	in addition to leave_notify_event.
	(fm_list_view_click_policy_changed): unref global hand_cursor and
	set it to NULL when changing to double click mode, create new cursor
	and assign it to hand_cursor when changing to single click one.
	(fm_list_view_finalize): free details->hover_path if necessary
	(fm_list_view_init): explicitly set details->hover_path to NULL