provide link-editor-and-mixer-selection option. gui implementation is slightly hacky because of the implicit endless loop that the link creates

git-svn-id: svn://localhost/ardour2/branches/3.0@10624 d708f5d6-7413-0410-9779-e7cbd77b26cf

18 files changed, 191 insertions, 42 deletions

diff --git a/gtk2_ardour/ardour_ui_dependents.cc b/gtk2_ardour/ardour_ui_dependents.cc
index 937ba5ab81..c55942b4bd 100644
--- a/gtk2_ardour/ardour_ui_dependents.cc
+++ b/gtk2_ardour/ardour_ui_dependents.cc
@@ -66,6 +66,9 @@ ARDOUR_UI::we_have_dependents ()
 	keyboard->setup_keybindings ();
 	editor->setup_tooltips ();
 	editor->UpdateAllTransportClocks.connect (sigc::mem_fun (*this, &ARDOUR_UI::update_transport_clocks));
+
+	editor->track_mixer_selection ();
+	mixer->track_editor_selection ();
 }
 
 void
diff --git a/gtk2_ardour/ardour_ui_mixer.cc b/gtk2_ardour/ardour_ui_mixer.cc
index b6983cd8ac..e3250d2a1f 100644
--- a/gtk2_ardour/ardour_ui_mixer.cc
+++ b/gtk2_ardour/ardour_ui_mixer.cc
@@ -35,7 +35,7 @@ ARDOUR_UI::create_mixer ()
 
 {
 	try {
-		mixer = new Mixer_UI ();
+		mixer = Mixer_UI::instance ();
 	}
 
 	catch (failed_constructor& err) {
diff --git a/gtk2_ardour/editor.cc b/gtk2_ardour/editor.cc
index e022ad67b5..80f7feed72 100644
--- a/gtk2_ardour/editor.cc
+++ b/gtk2_ardour/editor.cc
@@ -108,6 +108,7 @@
 #include "marker.h"
 #include "midi_time_axis.h"
 #include "mixer_strip.h"
+#include "mixer_ui.h"
 #include "mouse_cursors.h"
 #include "playlist_selector.h"
 #include "public_editor.h"
@@ -282,6 +283,7 @@ Editor::Editor ()
 	, _last_cut_copy_source_track (0)
 
 	, _region_selection_change_updates_region_list (true)
+	, _following_mixer_selection (false)
 {
 	constructed = false;
 
@@ -5005,7 +5007,7 @@ Editor::foreach_time_axis_view (sigc::slot<void,TimeAxisView&> theslot)
 
 /** Find a RouteTimeAxisView by the ID of its route */
 RouteTimeAxisView*
-Editor::get_route_view_by_route_id (PBD::ID& id) const
+Editor::get_route_view_by_route_id (const PBD::ID& id) const
 {
 	RouteTimeAxisView* v;
 
@@ -5499,3 +5501,4 @@ Editor::popup_control_point_context_menu (ArdourCanvas::Item* item, GdkEvent* ev
 
 	_control_point_context_menu.popup (event->button.button, event->button.time);
 }
+
diff --git a/gtk2_ardour/editor.h b/gtk2_ardour/editor.h
index 683cdc037a..e799e89664 100644
--- a/gtk2_ardour/editor.h
+++ b/gtk2_ardour/editor.h
@@ -201,7 +201,7 @@ class Editor : public PublicEditor, public PBD::ScopedConnectionList, public ARD
 	void foreach_time_axis_view (sigc::slot<void,TimeAxisView&>);
 	void add_to_idle_resize (TimeAxisView*, int32_t);
 
-	RouteTimeAxisView* get_route_view_by_route_id (PBD::ID& id) const;
+	RouteTimeAxisView* get_route_view_by_route_id (const PBD::ID& id) const;
 
 	void consider_auditioning (boost::shared_ptr<ARDOUR::Region>);
 	void hide_a_region (boost::shared_ptr<ARDOUR::Region>);
@@ -269,6 +269,7 @@ class Editor : public PublicEditor, public PBD::ScopedConnectionList, public ARD
 
 	Selection& get_selection() const { return *selection; }
 	Selection& get_cut_buffer() const { return *cut_buffer; }
+	void track_mixer_selection ();
 
 	bool extend_selection_to_track (TimeAxisView&);
 
@@ -2065,6 +2066,9 @@ class Editor : public PublicEditor, public PBD::ScopedConnectionList, public ARD
 
 	void resize_text_widgets ();
 
+	void follow_mixer_selection ();
+	bool _following_mixer_selection;
+
 	friend class Drag;
 	friend class RegionDrag;
 	friend class RegionMoveDrag;
diff --git a/gtk2_ardour/editor_mixer.cc b/gtk2_ardour/editor_mixer.cc
index 09e3764483..0817a31128 100644
--- a/gtk2_ardour/editor_mixer.cc
+++ b/gtk2_ardour/editor_mixer.cc
@@ -27,6 +27,8 @@
 
 #include "pbd/enumwriter.h"
 
+#include "ardour/rc_configuration.h"
+
 #include "actions.h"
 #include "ardour_ui.h"
 #include "audio_time_axis.h"
@@ -38,6 +40,7 @@
 #include "gui_thread.h"
 #include "midi_time_axis.h"
 #include "mixer_strip.h"
+#include "mixer_ui.h"
 #include "selection.h"
 
 #include "i18n.h"
@@ -251,3 +254,35 @@ Editor::mixer_strip_width_changed ()
 
 	editor_mixer_strip_width = current_mixer_strip->get_width_enum ();
 }
+
+void
+Editor::track_mixer_selection ()
+{
+	Mixer_UI::instance()->selection().RoutesChanged.connect (sigc::mem_fun (*this, &Editor::follow_mixer_selection));
+}
+
+void
+Editor::follow_mixer_selection ()
+{
+	if (!ARDOUR::Config->get_link_editor_and_mixer_selection() || _following_mixer_selection) {
+		return;
+	}
+
+	_following_mixer_selection = true;
+	selection->block_tracks_changed (true);
+
+	RouteUISelection& s (Mixer_UI::instance()->selection().routes);
+
+	selection->clear_tracks ();
+
+	for (RouteUISelection::iterator i = s.begin(); i != s.end(); ++i) {
+		TimeAxisView* tav = get_route_view_by_route_id ((*i)->route()->id());
+		if (tav) {
+			selection->add (tav);
+		}
+	}
+
+	_following_mixer_selection = false;
+	selection->block_tracks_changed (false);
+	selection->TracksChanged (); /* EMIT SIGNAL */
+}
diff --git a/gtk2_ardour/mixer_actor.h b/gtk2_ardour/mixer_actor.h
index 980938f8a2..85c7bc1cf8 100644
--- a/gtk2_ardour/mixer_actor.h
+++ b/gtk2_ardour/mixer_actor.h
@@ -35,14 +35,14 @@ class MixerActor : virtual public sigc::trackable
 	MixerActor ();
 	virtual ~MixerActor ();
 
-	RouteRedirectSelection& selection() { return _selection; }
+	RouteProcessorSelection& selection() { return _selection; }
 	void register_actions ();
 
         void load_bindings ();
         Gtkmm2ext::Bindings  bindings;
 
   protected:
-	RouteRedirectSelection _selection;
+	RouteProcessorSelection _selection;
 	RouteUISelection _route_targets;
         Gtkmm2ext::ActionMap myactions;
 
diff --git a/gtk2_ardour/mixer_ui.cc b/gtk2_ardour/mixer_ui.cc
index c3aa14d6e2..216c005178 100644
--- a/gtk2_ardour/mixer_ui.cc
+++ b/gtk2_ardour/mixer_ui.cc
@@ -47,6 +47,7 @@
 #include "mixer_strip.h"
 #include "monitor_section.h"
 #include "plugin_selector.h"
+#include "public_editor.h"
 #include "ardour_ui.h"
 #include "prompter.h"
 #include "utils.h"
@@ -65,8 +66,21 @@ using namespace std;
 
 using PBD::atoi;
 
+Mixer_UI* Mixer_UI::_instance = 0;
+
+Mixer_UI*
+Mixer_UI::instance () 
+{
+	if (!_instance) {
+		_instance  = new Mixer_UI;
+	} 
+
+	return _instance;
+}
+
 Mixer_UI::Mixer_UI ()
 	: Window (Gtk::WINDOW_TOPLEVEL)
+	, _following_editor_selection (false)
 {
 	/* allow this window to become the key focus window */
 	set_flags (CAN_FOCUS);
@@ -239,6 +253,13 @@ Mixer_UI::~Mixer_UI ()
 }
 
 void
+Mixer_UI::track_editor_selection ()
+{
+	PublicEditor::instance().get_selection().TracksChanged.connect (sigc::mem_fun (*this, &Mixer_UI::follow_editor_selection));
+}
+
+
+void
 Mixer_UI::ensure_float (Window& win)
 {
 	win.set_transient_for (*this);
@@ -431,6 +452,35 @@ Mixer_UI::sync_order_keys (string const & src)
 	}
 }
 
+void
+Mixer_UI::follow_editor_selection ()
+{
+	if (!Config->get_link_editor_and_mixer_selection() || _following_editor_selection) {
+		return;
+	}
+
+	_following_editor_selection = true;
+	_selection.block_routes_changed (true);
+	
+	TrackSelection& s (PublicEditor::instance().get_selection().tracks);
+
+	_selection.clear_routes ();
+
+	for (TrackViewList::iterator i = s.begin(); i != s.end(); ++i) {
+		RouteTimeAxisView* rtav = dynamic_cast<RouteTimeAxisView*> (*i);
+		if (rtav) {
+			MixerStrip* ms = strip_by_route (rtav->route());
+			if (ms) {
+				_selection.add (ms);
+			}
+		}
+	}
+
+	_following_editor_selection = false;
+	_selection.block_routes_changed (false);
+}
+
+
 MixerStrip*
 Mixer_UI::strip_by_route (boost::shared_ptr<Route> r)
 {
diff --git a/gtk2_ardour/mixer_ui.h b/gtk2_ardour/mixer_ui.h
index 6388ed5180..5a3b746457 100644
--- a/gtk2_ardour/mixer_ui.h
+++ b/gtk2_ardour/mixer_ui.h
@@ -55,10 +55,11 @@ class MonitorSection;
 class Mixer_UI : public Gtk::Window, public PBD::ScopedConnectionList, public ARDOUR::SessionHandlePtr, public MixerActor
 {
   public:
-	Mixer_UI ();
+	static Mixer_UI* instance();
 	~Mixer_UI();
 
 	void set_session (ARDOUR::Session *);
+	void track_editor_selection ();
 
 	PluginSelector* plugin_selector();
 
@@ -86,6 +87,9 @@ class Mixer_UI : public Gtk::Window, public PBD::ScopedConnectionList, public AR
 	void set_route_targets_for_operation ();
 
   private:
+	Mixer_UI ();
+	static Mixer_UI* _instance;
+
 	bool					_visible;
 
 	Gtk::HBox				global_hpacker;
@@ -146,8 +150,6 @@ class Mixer_UI : public Gtk::Window, public PBD::ScopedConnectionList, public AR
 	void strip_select_op (bool audiotrack, bool select);
 	void select_strip_op (MixerStrip*, bool select);
 
-	void follow_strip_selection ();
-
 	gint start_updating ();
 	gint stop_updating ();
 
@@ -270,6 +272,9 @@ class Mixer_UI : public Gtk::Window, public PBD::ScopedConnectionList, public AR
 	MixerStrip* strip_by_x (int x);
 
 	friend class MixerGroupTabs;
+
+	void follow_editor_selection ();
+	bool _following_editor_selection;
 };
 
 #endif /* __ardour_mixer_ui_h__ */
diff --git a/gtk2_ardour/processor_box.cc b/gtk2_ardour/processor_box.cc
index 9d6bc10682..47d8a56016 100644
--- a/gtk2_ardour/processor_box.cc
+++ b/gtk2_ardour/processor_box.cc
@@ -460,7 +460,7 @@ PluginInsertProcessorEntry::SplittingIcon::on_expose_event (GdkEventExpose* ev)
 }
 
 ProcessorBox::ProcessorBox (ARDOUR::Session* sess, boost::function<PluginSelector*()> get_plugin_selector,
-			    RouteRedirectSelection& rsel, MixerStrip* parent, bool owner_is_mixer)
+			    RouteProcessorSelection& rsel, MixerStrip* parent, bool owner_is_mixer)
 	: _parent_strip (parent)
 	, _owner_is_mixer (owner_is_mixer)
 	, ab_direction (true)
diff --git a/gtk2_ardour/processor_box.h b/gtk2_ardour/processor_box.h
index a17903c323..9bc45d716d 100644
--- a/gtk2_ardour/processor_box.h
+++ b/gtk2_ardour/processor_box.h
@@ -58,7 +58,7 @@
 class MotionController;
 class PluginSelector;
 class PluginUIWindow;
-class RouteRedirectSelection;
+class RouteProcessorSelection;
 class MixerStrip;
 
 namespace ARDOUR {
@@ -205,7 +205,7 @@ class ProcessorBox : public Gtk::HBox, public PluginInterestedObject, public ARD
 	};
 
 	ProcessorBox (ARDOUR::Session*, boost::function<PluginSelector*()> get_plugin_selector,
-		      RouteRedirectSelection&, MixerStrip* parent, bool owner_is_mixer = false);
+		      RouteProcessorSelection&, MixerStrip* parent, bool owner_is_mixer = false);
 	~ProcessorBox ();
 
 	void set_route (boost::shared_ptr<ARDOUR::Route>);
@@ -253,7 +253,7 @@ class ProcessorBox : public Gtk::HBox, public PluginInterestedObject, public ARD
 	 */
 	int _placement;
 
-	RouteRedirectSelection& _rr_selection;
+	RouteProcessorSelection& _rr_selection;
 
 	void route_going_away ();
 
diff --git a/gtk2_ardour/public_editor.h b/gtk2_ardour/public_editor.h
index d42605eb1b..c8352150fc 100644
--- a/gtk2_ardour/public_editor.h
+++ b/gtk2_ardour/public_editor.h
@@ -203,6 +203,7 @@ class PublicEditor : public Gtk::Window, public PBD::StatefulDestructible {
 	virtual gulong frame_to_pixel (framepos_t frame) const = 0;
 	virtual Selection& get_selection () const = 0;
 	virtual Selection& get_cut_buffer () const = 0;
+	virtual void track_mixer_selection () = 0;
 	virtual bool extend_selection_to_track (TimeAxisView&) = 0;
 	virtual void play_selection () = 0;
 	virtual void set_show_measures (bool yn) = 0;
@@ -286,7 +287,7 @@ class PublicEditor : public Gtk::Window, public PBD::StatefulDestructible {
 	virtual TimeAxisView* get_named_time_axis(const std::string & name)  = 0;
 #endif
 
-	virtual RouteTimeAxisView* get_route_view_by_route_id (PBD::ID& id) const = 0;
+	virtual RouteTimeAxisView* get_route_view_by_route_id (const PBD::ID& id) const = 0;
 
 	virtual void get_equivalent_regions (RegionView* rv, std::vector<RegionView*>&, PBD::PropertyID) const = 0;
 
diff --git a/gtk2_ardour/rc_option_editor.cc b/gtk2_ardour/rc_option_editor.cc
index 5e7df484ea..249846a296 100644
--- a/gtk2_ardour/rc_option_editor.cc
+++ b/gtk2_ardour/rc_option_editor.cc
@@ -1109,6 +1109,14 @@ RCOptionEditor::RCOptionEditor ()
 
 	add_option (_("Editor"),
 	     new BoolOption (
+		     "link-editor-and-mixer-selection",
+		     _("Synchronise editor and mixer selection"),
+		     sigc::mem_fun (*_rc_config, &RCConfiguration::get_link_editor_and_mixer_selection),
+		     sigc::mem_fun (*_rc_config, &RCConfiguration::set_link_editor_and_mixer_selection)
+		     ));
+
+	add_option (_("Editor"),
+	     new BoolOption (
 		     "name-new-markers",
 		     _("Name new markers"),
 		     sigc::mem_fun (*_rc_config, &RCConfiguration::get_name_new_markers),
diff --git a/gtk2_ardour/route_params_ui.h b/gtk2_ardour/route_params_ui.h
index d520e2988a..0da47bd4d4 100644
--- a/gtk2_ardour/route_params_ui.h
+++ b/gtk2_ardour/route_params_ui.h
@@ -123,7 +123,7 @@ class RouteParams_UI : public ArdourDialog, public PBD::ScopedConnectionList
 	IOSelector     * _output_iosel;
 
 	PluginSelector    *_plugin_selector;
-	RouteRedirectSelection  _rr_selection;
+	RouteProcessorSelection  _rr_selection;
 
 	boost::shared_ptr<ARDOUR::Route> _route;
 	PBD::ScopedConnection _route_processors_connection;
diff --git a/gtk2_ardour/route_processor_selection.cc b/gtk2_ardour/route_processor_selection.cc
index 9022119729..1b4c0c538b 100644
--- a/gtk2_ardour/route_processor_selection.cc
+++ b/gtk2_ardour/route_processor_selection.cc
@@ -36,8 +36,13 @@ using namespace std;
 using namespace ARDOUR;
 using namespace PBD;
 
-RouteRedirectSelection&
-RouteRedirectSelection::operator= (const RouteRedirectSelection& other)
+RouteProcessorSelection::RouteProcessorSelection()
+	: _no_route_change_signal (false)
+{
+}
+
+RouteProcessorSelection&
+RouteProcessorSelection::operator= (const RouteProcessorSelection& other)
 {
 	if (&other != this) {
 		processors = other.processors;
@@ -47,39 +52,41 @@ RouteRedirectSelection::operator= (const RouteRedirectSelection& other)
 }
 
 bool
-operator== (const RouteRedirectSelection& a, const RouteRedirectSelection& b)
+operator== (const RouteProcessorSelection& a, const RouteProcessorSelection& b)
 {
 	// XXX MUST TEST PROCESSORS SOMEHOW
 	return a.routes == b.routes;
 }
 
 void
-RouteRedirectSelection::clear ()
+RouteProcessorSelection::clear ()
 {
 	clear_processors ();
 	clear_routes ();
 }
 
 void
-RouteRedirectSelection::clear_processors ()
+RouteProcessorSelection::clear_processors ()
 {
 	processors.clear ();
 	ProcessorsChanged ();
 }
 
 void
-RouteRedirectSelection::clear_routes ()
+RouteProcessorSelection::clear_routes ()
 {
 	for (RouteUISelection::iterator i = routes.begin(); i != routes.end(); ++i) {
 		(*i)->set_selected (false);
 	}
 	routes.clear ();
 	drop_connections ();
-	RoutesChanged ();
+	if (!_no_route_change_signal) {
+		RoutesChanged ();
+	}
 }
 
 void
-RouteRedirectSelection::add (XMLNode* node)
+RouteProcessorSelection::add (XMLNode* node)
 {
 	// XXX check for duplicate
 	processors.add (node);
@@ -87,7 +94,7 @@ RouteRedirectSelection::add (XMLNode* node)
 }
 
 void
-RouteRedirectSelection::set (XMLNode* node)
+RouteProcessorSelection::set (XMLNode* node)
 {
 	clear_processors ();
 	processors.set (node);
@@ -95,7 +102,7 @@ RouteRedirectSelection::set (XMLNode* node)
 }
 
 void
-RouteRedirectSelection::add (RouteUI* r)
+RouteProcessorSelection::add (RouteUI* r)
 {
 	if (find (routes.begin(), routes.end(), r) == routes.end()) {
 		if (routes.insert (r).second) {
@@ -104,43 +111,52 @@ RouteRedirectSelection::add (RouteUI* r)
 			MixerStrip* ms = dynamic_cast<MixerStrip*> (r);
 			
 			if (ms) {
-				ms->CatchDeletion.connect (*this, invalidator (*this), ui_bind (&RouteRedirectSelection::remove, this, _1), gui_context());
+				ms->CatchDeletion.connect (*this, invalidator (*this), ui_bind (&RouteProcessorSelection::remove, this, _1), gui_context());
+			}
+			
+			if (!_no_route_change_signal) {
+				RoutesChanged();
 			}
-
-			RoutesChanged();
 		}
 	}
 }
 
 void
-RouteRedirectSelection::remove (RouteUI* r)
+RouteProcessorSelection::remove (RouteUI* r)
 {
-	ENSURE_GUI_THREAD (*this, &RouteRedirectSelection::remove, r);
+	ENSURE_GUI_THREAD (*this, &RouteProcessorSelection::remove, r);
 
 	RouteUISelection::iterator i;
 	if ((i = find (routes.begin(), routes.end(), r)) != routes.end()) {
 		routes.erase (i);
 		(*i)->set_selected (false);
-		RoutesChanged ();
+		if (!_no_route_change_signal) {
+			RoutesChanged ();
+		}
 	}
 }
 
 void
-RouteRedirectSelection::set (RouteUI* r)
+RouteProcessorSelection::set (RouteUI* r)
 {
 	clear_routes ();
 	add (r);
 }
 
 bool
-RouteRedirectSelection::selected (RouteUI* r)
+RouteProcessorSelection::selected (RouteUI* r)
 {
 	return find (routes.begin(), routes.end(), r) != routes.end();
 }
 
 bool
-RouteRedirectSelection::empty ()
+RouteProcessorSelection::empty ()
 {
 	return processors.empty () && routes.empty ();
 }
 
+void
+RouteProcessorSelection::block_routes_changed (bool yn)
+{
+	_no_route_change_signal = yn;
+}
diff --git a/gtk2_ardour/route_processor_selection.h b/gtk2_ardour/route_processor_selection.h
index 08616f0d50..3f8bb1a08c 100644
--- a/gtk2_ardour/route_processor_selection.h
+++ b/gtk2_ardour/route_processor_selection.h
@@ -26,19 +26,21 @@
 #include "processor_selection.h"
 #include "route_ui_selection.h"
 
-class RouteRedirectSelection : public PBD::ScopedConnectionList, public sigc::trackable
+class RouteProcessorSelection : public PBD::ScopedConnectionList, public sigc::trackable
 {
   public:
 	ProcessorSelection processors;
 	RouteUISelection     routes;
 
-	RouteRedirectSelection() {}
+	RouteProcessorSelection();
 
-	RouteRedirectSelection& operator= (const RouteRedirectSelection& other);
+	RouteProcessorSelection& operator= (const RouteProcessorSelection& other);
 
 	sigc::signal<void> ProcessorsChanged;
 	sigc::signal<void> RoutesChanged;
 
+	void block_routes_changed (bool);
+
 	void clear ();
 	bool empty();
 
@@ -56,9 +58,10 @@ class RouteRedirectSelection : public PBD::ScopedConnectionList, public sigc::tr
 
   private:
 	void removed (RouteUI*);
+	bool _no_route_change_signal;
 
 };
 
-bool operator==(const RouteRedirectSelection& a, const RouteRedirectSelection& b);
+bool operator==(const RouteProcessorSelection& a, const RouteProcessorSelection& b);
 
 #endif /* __ardour_gtk_route_processor_selection_h__ */
diff --git a/gtk2_ardour/selection.cc b/gtk2_ardour/selection.cc
index 5b7a88c81e..0b15bbec08 100644
--- a/gtk2_ardour/selection.cc
+++ b/gtk2_ardour/selection.cc
@@ -51,6 +51,7 @@ Selection::Selection (const PublicEditor* e)
 	: tracks (e)
 	, editor (e)
 	, next_time_id (0)
+	, _no_tracks_changed (false)
 {
 	clear ();
 
@@ -129,7 +130,9 @@ Selection::clear_tracks ()
 {
 	if (!tracks.empty()) {
 		tracks.clear ();
-		TracksChanged();
+		if (!_no_tracks_changed) {
+			TracksChanged();
+		}
 	}
 }
 
@@ -231,7 +234,9 @@ Selection::toggle (TimeAxisView* track)
 		tracks.erase (i);
 	}
 
-	TracksChanged();
+	if (!_no_tracks_changed) {
+		TracksChanged();
+	}
 }
 
 void
@@ -353,7 +358,9 @@ Selection::add (const TrackViewList& track_list)
 	TrackViewList added = tracks.add (track_list);
 
 	if (!added.empty()) {
-		TracksChanged ();
+		if (!_no_tracks_changed) {
+			TracksChanged ();
+		}
 	}
 }
 
@@ -519,7 +526,9 @@ Selection::remove (TimeAxisView* track)
 	list<TimeAxisView*>::iterator i;
 	if ((i = find (tracks.begin(), tracks.end(), track)) != tracks.end()) {
 		tracks.erase (i);
-		TracksChanged();
+		if (!_no_tracks_changed) {
+			TracksChanged();
+		}
 	}
 }
 
@@ -538,7 +547,9 @@ Selection::remove (const TrackViewList& track_list)
 	}
 
 	if (changed) {
-		TracksChanged();
+		if (!_no_tracks_changed) {
+			TracksChanged();
+		}
 	}
 }
 
@@ -1232,3 +1243,9 @@ Selection::remove_regions (TimeAxisView* t)
 		i = tmp;
 	}
 }
+
+void
+Selection::block_tracks_changed (bool yn)
+{
+	_no_tracks_changed = yn;
+}
diff --git a/gtk2_ardour/selection.h b/gtk2_ardour/selection.h
index ded71c65e5..c474faa5b2 100644
--- a/gtk2_ardour/selection.h
+++ b/gtk2_ardour/selection.h
@@ -104,6 +104,8 @@ class Selection : public sigc::trackable, public PBD::ScopedConnectionList
 	sigc::signal<void> MidiNotesChanged;
 	sigc::signal<void> MidiRegionsChanged;
 
+	void block_tracks_changed (bool);
+
 	void clear ();
 	bool empty (bool internal_selection = false);
 
@@ -204,6 +206,7 @@ class Selection : public sigc::trackable, public PBD::ScopedConnectionList
 
 	PublicEditor const * editor;
 	uint32_t next_time_id;
+	bool _no_tracks_changed;
 };
 
 bool operator==(const Selection& a, const Selection& b);
diff --git a/libs/ardour/ardour/rc_configuration_vars.h b/libs/ardour/ardour/rc_configuration_vars.h
index 035bc34553..35f5ce9838 100644
--- a/libs/ardour/ardour/rc_configuration_vars.h
+++ b/libs/ardour/ardour/rc_configuration_vars.h
@@ -73,6 +73,7 @@ CONFIG_VARIABLE (bool, use_osc, "use-osc", false)
 
 CONFIG_VARIABLE (EditMode, edit_mode, "edit-mode", Slide)
 CONFIG_VARIABLE (bool, link_region_and_track_selection, "link-region-and-track-selection", false)
+CONFIG_VARIABLE (bool, link_editor_and_mixer_selection, "link-editor-and-mixer-selection", false)
 CONFIG_VARIABLE (std::string, keyboard_layout_name, "keyboard-layout-name", "ansi")
 CONFIG_VARIABLE (bool, automation_follows_regions, "automation-follows-regions", true)
 CONFIG_VARIABLE (bool, region_boundaries_from_selected_tracks, "region-boundaries-from-selected-tracks", true)