From fb0bb5aafab2f240dc07d82ad61ab81af455e92a Mon Sep 17 00:00:00 2001
From: Robin Gareus <robin@gareus.org>
Date: Wed, 7 Jan 2026 15:22:11 +0100
Subject: [PATCH] Editor-Summary shift rotates scroll direction #10105

---
 gtk2_ardour/editor_summary.cc | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/gtk2_ardour/editor_summary.cc b/gtk2_ardour/editor_summary.cc
index 78e7fb5d6b..97b0f9ec24 100644
--- a/gtk2_ardour/editor_summary.cc
+++ b/gtk2_ardour/editor_summary.cc
@@ -29,6 +29,7 @@
 #include <ytkmm/menuitem.h>
 
 #include "context_menu_helper.h"
+#include "gdk.h"
 #include "streamview.h"
 #include "editor_summary.h"
 #include "gui_thread.h"
@@ -773,7 +774,22 @@ EditorSummary::on_scroll_event (GdkEventScroll* ev)
 	get_editor (&xr);
 	double x = xr.first;
 
-	switch (ev->direction) {
+	GdkScrollDirection direction = ev->direction;
+
+	if (ev->state & Keyboard::TertiaryModifier) {
+		switch (ev->direction) {
+			case GDK_SCROLL_UP:
+				direction = GDK_SCROLL_LEFT;
+				break;
+			case GDK_SCROLL_DOWN:
+				direction = GDK_SCROLL_RIGHT;
+				break;
+			default:
+				break;
+		}
+	}
+
+	switch (direction) {
 		case GDK_SCROLL_UP: {
 
 			summary_zoom_step (-4);