Fixed bug 2131 (Change Nautilus to use OAF asynchronous activation
	interface). In making view activation work right, I also
	eliminated the state machine that was almost gone from
	NautilusWindow. There's still some additional simplification we
	can do, but it's simpler than it was. At the same time, made sure
	all incoming CORBA calls are deferred until idle time. This is
	most of what the old state machine was accomplishing, believe it
	or not, although it didn't do it 100%.

	Also fixes bug 2457 (Silent error loading content view), bug 2461
	(progress from old and new content view sometimes confused), and
	bug 6109 (Assertion hit on clicking the refresh button many times
	very quickly). Perhaps others too, we need to test some old bugs
	to see if they have changed behavior.

	* libnautilus-extensions/nautilus-bonobo-extensions.c:
	(activation_handle_done), (activation_idle_callback),
	(activation_cancel), (oaf_activation_callback),
	(nautilus_bonobo_activate_cancel): Change implementation so that
	the actual callback happens at idle time, since CORBA callbacks
	can happen at almost any time.

	* libnautilus/Makefile.am:
	* libnautilus/nautilus-idle-queue.h:
	* libnautilus/nautilus-idle-queue.c: (execute_queued_functions),
	(nautilus_idle_queue_new), (nautilus_idle_queue_add),
	(nautilus_idle_queue_destroy): Factored out the idle queueing that
	I added to NautilusView so we can use it on the NautilusViewFrame
	side too.

	* libnautilus/nautilus-view.c: (queue_incoming_call),
	(nautilus_view_initialize), (nautilus_view_destroy): Change to use
	the new NautilusIdleQueue so we can share code.

	* src/nautilus-view-frame-private.h:
	* src/nautilus-view-frame-corba.c: (list_free_deep_callback),
	(free_location_and_selection_callback), (open_in_this_window),
	(open_prefer_existing_window), (open_force_new_window),
	(report_selection_change), (report_status),
	(report_load_underway), (report_load_progress),
	(report_load_complete), (report_load_failed), (set_title),
	(impl_Nautilus_ViewFrame_open_location_in_this_window),
	(impl_Nautilus_ViewFrame_open_location_prefer_existing_window),
	(impl_Nautilus_ViewFrame_open_location_force_new_window),
	(impl_Nautilus_ViewFrame_report_selection_change),
	(impl_Nautilus_ViewFrame_report_status),
	(impl_Nautilus_ViewFrame_report_load_underway),
	(impl_Nautilus_ViewFrame_report_load_progress),
	(impl_Nautilus_ViewFrame_report_load_complete),
	(impl_Nautilus_ViewFrame_report_load_failed),
	(impl_Nautilus_ViewFrame_set_title): Deal with all incoming CORBA
	calls through the idle queue.

	* src/nautilus-view-frame.h: Moved all the fields into
	details. Renamed client_loaded to view_loaded. Renamed load_client
	to load_view. Eliminated load_client_sync. Renamed get_iid to
	get_view_iid. Eliminated get_is_underway. Added
	get_is_view_loaded.
	* src/nautilus-view-frame.c:
	(nautilus_view_frame_queue_incoming_call): Simple cover for
	putting an incoming CORBA call on the idle queue.
	(nautilus_view_frame_initialize_class): Change client_loaded
	signal name to view_loaded.
	(nautilus_view_frame_initialize): Allocate the idle queue.
	(stop_activation): New function that stops a load_view that is
	underway.
	(destroy_view): Use the "view" field to tell if a view was
	loaded. The old code used the "iid" field, but now we set that
	even before the load is completed.
	(nautilus_view_frame_destroy): Destroy the idle queue. Also put
	the view into "failed" state once it's destroyed so additional
	calls are harmless.
	(nautilus_view_frame_finalize): Check that we're in the failed
	state.
	(emit_zoom_parameters_changed): New function so we can share more
	code.
	(view_frame_activated): Emit the zoom_parameters_changed signal
	here since a new view should always should get this signal.
	(view_frame_underway): Make this do nothing in the failed case
	instead of complaining.
	(view_frame_loaded): Make this do nothing in the failed case
	instead of complaining.
	(view_frame_failed): Stop whatever's in progress when the view
	fails. Also, allow calling this on a view that's already failed.
	(check_if_view_is_gone): Consolidate the calls to
	deregister_dead_components so we don't need an explicit call here.
	(emit_zoom_parameters_changed_callback),
	(zoom_parameters_changed_callback),
	(emit_zoom_level_changed_callback), (zoom_level_changed_callback):
	Redo these so they queue onto the idle queue, since they are
	triggered by incoming CORBA calls that can happen at any time.
	(create_corba_objects): Factor out the part of the code that makes
	the CORBA objects. Make error handling more complete and keep
	around pointers to the Bonobo objects for various parts of the
	aggregate so we can connect the appropriate signal handlers.
	(attach_view): Change code so it no longer connects signals to the
	BonoboObjectClient, since the signals won't go out on that
	GtkObject. Connect to the exception signals for all objects in the
	aggregate (any failure means "view failed"). Also connect to the
	"destroy" signal for one object (doesn't matter which since the
	entire aggregate goes away at once) and to the zoom-related
	signals. Report errors with signals rather than returning a
	boolean.
	(activation_callback): Add code to handle failure case.
	(nautilus_view_frame_load_view): Renamed. Got rid of "sync."
	version.
	(nautilus_view_frame_stop): Stop OAF activation of the view if
	it's in progress.
	(nautilus_view_frame_selection_changed): Make it a quiet no-op to
	send a selection change notice if no view is loaded. This helps
	keep the code simple for sidebars. Later we may make the view
	frame responsible for sending the selection on once the view is
	loaded.
	(nautilus_view_frame_title_changed): Same change as for selection,
	same idea.
	(nautilus_view_frame_get_is_zoomable),
	(nautilus_view_frame_get_zoom_level),
	(nautilus_view_frame_set_zoom_level),
	(nautilus_view_frame_get_min_zoom_level),
	(nautilus_view_frame_get_max_zoom_level),
	(nautilus_view_frame_get_has_min_zoom_level),
	(nautilus_view_frame_get_has_max_zoom_level),
	(nautilus_view_frame_get_is_continuous),
	(nautilus_view_frame_get_preferred_zoom_levels),
	(nautilus_view_frame_zoom_in), (nautilus_view_frame_zoom_out),
	(nautilus_view_frame_zoom_to_fit): Since a failed view has a
	zoomable_frame field set to NULL, got rid of all the explicit
	failure-case code for these functions.
	(nautilus_view_frame_get_view_iid): Renamed from get_iid.
	(nautilus_view_frame_report_load_underway),
	(nautilus_view_frame_report_load_complete),
	(nautilus_view_frame_report_load_failed): Moved the "quiet"
	handling of failed views down into the underlying functions, so
	these no longer need explicit failure-case code.
	(nautilus_view_frame_set_label): It's OK to allow this even for a
	failed view.
	(nautilus_view_frame_map): Use a kept-around reference to the
	control frame instead of relying on query_local_interface.
	(nautilus_view_frame_get_is_view_loaded): Add this so callers can
	tell when a sidebar view is not yet loaded. Might not need this
	when we clean things up more, but it's no big deal either way.

	* src/nautilus-window-manage-views.c: (update_title): No need to
	send the title change to the new content view -- it gets a title
	change once it comes up "for real".
	(set_displayed_location): Handle location of NULL here so we don't
	need to worry about it elsewhere.
	(check_bookmark_location_matches): Remove "uri" from name.
	(location_has_really_changed): Now that the state machine is gone,
	it's easy to see that this is never called with pending_ni equal
	to cancel_tag, so remove the code for that and add an assert.
	(set_view_location_and_selection): New name for what was called
	update_view.
	(set_sidebar_panels_location_and_selection): Cover since this loop
	occurs in two places.
	(update_for_new_location_and_selection): New name for what was
	called set_view_location_and_selection. Since it's now clear this
	can't be called with new_content_view equal to NULL, remove the
	code to handle that (fixes bug 2457).
	(load_content_view): Use async. view loading here. Get rid of
	"Avoid being fooled by extra done notifications from the last
	view. This is a HACK because the state machine SUCKS." by
	eliminating the "cv_progress_done" and "cv_progress_error" flags
	altogether. In the case where we reuse the same view, just call
	update_for_new_location_and_selection -- the old code set
	"view_activation_complete", but I eliminated that flag.
	(handle_view_failure): Remove the old view using
	nautilus_window_set_content_view_widget instead of having
	duplicate code here. Use a call to cancel_location_change instead
	of setting the "reset_to_idle" and "cv_progress_error" flags
	(both gone now).
	(free_location_change): No need to clean up "error_views" any
	more, because that field is gone.
	(end_location_change): New helper to stop the throbber from
	throbbing and then free the location change state.
	(cancel_location_change): Get rid of special case for NULL
	location now that set_displayed_location can handle it.
	(nautilus_window_end_location_change_callback): Remove
	"superstitiously" added call to update_state and call
	load_content_view_for_new_location directly.
	(nautilus_window_begin_location_change): Use a call to
	cancel_location_change to deal with the possibility that we may
	have a change already in progress.
	(nautilus_window_stop_loading): Use cancel_location_change to stop
	the loading.
	(nautilus_window_set_content_view): Remove calls to update_state
	-- there's no state to update any more.
	(nautilus_window_set_sidebar_panels): Do an async. load here and
	finish the setup in the view_loaded callback.
	(failed_callback): Do a handle_view_failed right here, now that we
	have no state machine to satisfy.
	(load_underway_callback): Change code to handle the two
	interesting cases separately without a state machine. When the new
	content view says "underway", it's time for
	location_has_really_changed. When an existing content view says
	"underway", we restart the throbber (fixes 1/2 of bug 2461).
	(load_complete_callback): Since view frames now ensure we get an
	underway call before a complete call, we can simplify the
	logic. If the main content view says "complete", it's time to stop
	the throbber (fixes other 1/2 of bug 2461).
	(view_loaded_callback): Renamed the client_loaded callback. Also
	made it update location and selection for sidebar panels when they
	are loaded. Also made it update the title for any view when it's
	loaded.

	* src/nautilus-window.h:
	* src/nautilus-window.c: (nautilus_window_synch_view_as_menu):
	Handle case of NULL content view.
	(nautilus_window_set_content_view_widget): Destroy the view when
	it's going away instead of removing it from the parent. Also make
	this function handle the NULL case so we can use it to remove the
	old view, not just to add the new one.

	* libnautilus-extensions/nautilus-bonobo-extensions.h: Whitespace
	tweak.

	* src/nautilus-sidebar.c:
	(nautilus_sidebar_active_panel_matches_id): Update for
	nautilus_view_frame_get_view_iid name change.