From 1ae5ea0e92c91db0e810cc11c6572a904e56fa2d Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Wed, 8 Jan 2025 14:11:47 -0700
Subject: [PATCH] prwevent scroll-driven zoom in pianoroll from exceeding a
 reasonable level

---
 gtk2_ardour/editing_context.cc | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/gtk2_ardour/editing_context.cc b/gtk2_ardour/editing_context.cc
index 2442b245af..9f10f9cb06 100644
--- a/gtk2_ardour/editing_context.cc
+++ b/gtk2_ardour/editing_context.cc
@@ -2498,6 +2498,13 @@ EditingContext::reset_y_origin (double y)
 void
 EditingContext::reset_zoom (samplecnt_t spp)
 {
+	std::pair<timepos_t, timepos_t> ext = max_zoom_extent();
+	samplecnt_t max_extents_pp = (ext.second.samples() - ext.first.samples())  / _visible_canvas_width;
+
+	if (spp > max_extents_pp) {
+		spp = max_extents_pp;
+	}
+
 	if (spp == samples_per_pixel) {
 		return;
 	}