some code shuffling to make sure that cut mode always operates at the mouse location, with (maybe) the right regions

gtk2_ardour/editor.cc

@@ -4560,6 +4560,50 @@ Editor::get_regions_from_selection_and_edit_point ()
 	return regions;
 }
 
+/** Get regions using the following method:
+ *
+ *  Make a region list using:
+ *   (a) any selected regions
+ *   (b) the intersection of any selected tracks and the edit point(*)
+ *   (c) if neither exists, then whatever region is under the mouse
+ *
+ *  (*) NOTE: in this case, if 'No Selection = All Tracks' is active, search all tracks
+ *
+ *  Note that we have forced the rule that selected regions and selected tracks are mutually exclusive
+ */
+RegionSelection
+Editor::get_regions_from_selection_and_mouse ()
+{
+	RegionSelection regions;
+
+	if (entered_regionview && selection->tracks.empty() && selection->regions.empty() ) {
+		regions.add (entered_regionview);
+	} else {
+		regions = selection->regions;
+	}
+
+	if ( regions.empty() ) {
+		TrackViewList tracks = selection->tracks;
+
+		if (_route_groups->all_group_active_button().get_active() && tracks.empty()) {
+			/* tracks is empty (no track selected), and 'No Selection = All Tracks'
+			 * is enabled, so consider all tracks
+			 */
+			tracks = track_views; 
+		}
+
+		if (!tracks.empty()) {
+			/* no region selected or entered, but some selected tracks:
+			 * act on all regions on the selected tracks at the edit point
+			 */ 
+			framepos_t const where = get_preferred_edit_position ();
+			get_regions_at(regions, where, tracks);
+		}
+	}
+
+	return regions;
+}
+
 /** Start with regions that are selected, or the entered regionview if none are selected.
  *  Then add equivalent regions on tracks in the same active edit-enabled route group as any
  *  of the regions that we started with.

gtk2_ardour/editor.h

@@ -472,8 +472,9 @@ class Editor : public PublicEditor, public PBD::ScopedConnectionList, public ARD
 
 	/* editing operations that need to be public */
 	void mouse_add_new_marker (framepos_t where, bool is_cd=false, bool is_xrun=false);
-	void split_region ();
+	void split_regions_at (framepos_t, RegionSelection&);
 	void split_region_at_points (boost::shared_ptr<ARDOUR::Region>, ARDOUR::AnalysisFeatureList&, bool can_ferret, bool select_new = false);
+	RegionSelection get_regions_from_selection_and_mouse ();
 	
   protected:
 	void map_transport_state ();
@@ -1137,7 +1138,6 @@ class Editor : public PublicEditor, public PBD::ScopedConnectionList, public ARD
 	void change_region_layering_order (bool from_context_menu);
 	void lower_region ();
 	void lower_region_to_bottom ();
-	void split_regions_at (framepos_t, RegionSelection&);
 	void split_region_at_transients ();
 	void crop_region_to_selection ();
 	void crop_region_to (framepos_t start, framepos_t end);
@@ -1190,6 +1190,8 @@ class Editor : public PublicEditor, public PBD::ScopedConnectionList, public ARD
 
 	void reset_focus ();
 
+	void split_region ();
+
 	void delete_ ();
 	void cut ();
 	void copy ();

gtk2_ardour/editor_drag.cc

@@ -5449,11 +5449,12 @@ CrossfadeEdgeDrag::aborted (bool)
 	}
 }
 
-RegionCutDrag::RegionCutDrag (Editor* e, ArdourCanvas::Item* item)
+RegionCutDrag::RegionCutDrag (Editor* e, ArdourCanvas::Item* item, framepos_t pos)
 	: Drag (e, item, true)
 	, line (new EditorCursor (*e))
 {
-	line->set_position (_editor->get_preferred_edit_position());
+	line->set_position (pos);
+	line->show ();
 }
 
 RegionCutDrag::~RegionCutDrag ()
@@ -5471,7 +5472,14 @@ void
 RegionCutDrag::finished (GdkEvent*, bool)
 {
 	line->hide ();
-	_editor->split_region ();
+
+	RegionSelection rs = _editor->get_regions_from_selection_and_mouse ();
+
+	if (rs.empty()) {
+		return;
+	}
+
+	_editor->split_regions_at (_drags->current_pointer_frame(), rs);
 }
 
 void

gtk2_ardour/editor_drag.h

@@ -444,7 +444,7 @@ private:
 class RegionCutDrag : public Drag
 {
     public:
-	RegionCutDrag (Editor*, ArdourCanvas::Item*);
+	RegionCutDrag (Editor*, ArdourCanvas::Item*, framepos_t);
 	~RegionCutDrag ();
 
 	void motion (GdkEvent*, bool);

gtk2_ardour/editor_mouse.cc

@@ -857,7 +857,7 @@ Editor::button_press_handler_1 (ArdourCanvas::Item* item, GdkEvent* event, ItemT
 		case FeatureLineItem:
 		case RegionViewNameHighlight:
 		case RegionViewName:
-			_drags->set (new RegionCutDrag (this, item), event, current_canvas_cursor);
+			_drags->set (new RegionCutDrag (this, item, canvas_event_sample (event)), event, current_canvas_cursor);
 			return true;
 			break;
 		default:

gtk2_ardour/public_editor.h

@@ -295,7 +295,7 @@ class PublicEditor : public Gtk::Window, public PBD::StatefulDestructible, publi
 	virtual void update_tearoff_visibility () = 0;
 	virtual framepos_t get_preferred_edit_position (bool ignore_playhead = false, bool from_context_menu = false) = 0;
 	virtual void toggle_meter_updating() = 0;
-	virtual void split_region () = 0;
+	virtual void split_regions_at (framepos_t, RegionSelection&) = 0;
 	virtual void split_region_at_points (boost::shared_ptr<ARDOUR::Region>, ARDOUR::AnalysisFeatureList&, bool can_ferret, bool select_new = false) = 0;
 	virtual void mouse_add_new_marker (framepos_t where, bool is_cd=false, bool is_xrun=false) = 0;
 	virtual void foreach_time_axis_view (sigc::slot<void,TimeAxisView&>) = 0;
@@ -416,6 +416,7 @@ class PublicEditor : public Gtk::Window, public PBD::StatefulDestructible, publi
 	virtual void snap_to_with_modifier (framepos_t &, GdkEvent const *, int32_t direction = 0, bool for_mark = false) = 0;
 
 	virtual void get_regions_at (RegionSelection &, framepos_t where, TrackViewList const &) const = 0;
+	virtual RegionSelection get_regions_from_selection_and_mouse () = 0;
 
 	/// Singleton instance, set up by Editor::Editor()