From 945ce377aa4460b7e89b14d8fd1a6909fa038b65 Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Tue, 3 Oct 2023 16:00:35 -0600
Subject: [PATCH] tempo mapping (like all other drags) must use button1 only

Without this, Editor::button_release_handler() will handle a button3 press
without checking for an active drag, resulting in two drags, and two reversible
commands, and an abort ...
---
 gtk2_ardour/editor_canvas_events.cc | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/gtk2_ardour/editor_canvas_events.cc b/gtk2_ardour/editor_canvas_events.cc
index b6129af5e9..b65af5ac09 100644
--- a/gtk2_ardour/editor_canvas_events.cc
+++ b/gtk2_ardour/editor_canvas_events.cc
@@ -1293,10 +1293,13 @@ Editor::canvas_grid_zone_event (GdkEvent* event)
 	GdkEventScroll scroll;
 	ArdourCanvas::Duple winpos;
 
+
 	switch (event->type) {
 
 		case GDK_BUTTON_PRESS:
-			choose_mapping_drag (_canvas_grid_zone, event);
+			if (event->button.button == 1) {
+				choose_mapping_drag (_canvas_grid_zone, event);
+			}
 			break;
 
 		case GDK_BUTTON_RELEASE: