From 067a124fd1feb96f63fc062601ec685c0a8209b3 Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Fri, 8 Dec 2023 21:48:23 +0100
Subject: [PATCH] Suspend signal emission of Locations during Drag

This significantly speeds up Location Drag/motion
---
 gtk2_ardour/editor_drag.cc | 3 ++-
 gtk2_ardour/editor_drag.h  | 2 ++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/gtk2_ardour/editor_drag.cc b/gtk2_ardour/editor_drag.cc
index 008f89989f..32296512b7 100644
--- a/gtk2_ardour/editor_drag.cc
+++ b/gtk2_ardour/editor_drag.cc
@@ -4346,7 +4346,7 @@ MarkerDrag::~MarkerDrag ()
 
 MarkerDrag::CopiedLocationMarkerInfo::CopiedLocationMarkerInfo (Location* l, ArdourMarker* m)
 {
-	location = new Location (*l);
+	location = new Location (*l, true);
 	markers.push_back (m);
 	move_both = false;
 }
@@ -4431,6 +4431,7 @@ MarkerDrag::start_grab (GdkEvent* event, Gdk::Cursor* cursor)
 		if (!l) {
 			continue;
 		}
+		lcs.push_back (l);
 
 		if (l->is_mark ()) {
 			_copied_locations.push_back (CopiedLocationMarkerInfo (l, *i));
diff --git a/gtk2_ardour/editor_drag.h b/gtk2_ardour/editor_drag.h
index 46f97a6810..d1f7deb55a 100644
--- a/gtk2_ardour/editor_drag.h
+++ b/gtk2_ardour/editor_drag.h
@@ -1176,6 +1176,8 @@ private:
 		CopiedLocationMarkerInfo (ARDOUR::Location* l, ArdourMarker* m);
 	};
 
+	std::vector<ARDOUR::Location::ChangeSuspender> lcs;
+
 	typedef std::list<CopiedLocationMarkerInfo> CopiedLocationInfo;
 	CopiedLocationInfo _copied_locations;
 	ArdourCanvas::Points _points;