From b93a61998d7d44ea0830570f1fcb41ecd5c1cb98 Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Fri, 11 Jul 2025 23:03:31 -0600
Subject: [PATCH] fix arithmetic/offset when determining if mouse is inside
 scroomer

---
 gtk2_ardour/prh_base.cc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/gtk2_ardour/prh_base.cc b/gtk2_ardour/prh_base.cc
index 716bca7dde..1863cde35b 100644
--- a/gtk2_ardour/prh_base.cc
+++ b/gtk2_ardour/prh_base.cc
@@ -528,6 +528,10 @@ PianoRollHeaderBase::motion_handler (GdkEventMotion* ev)
 		double scroomer_top = max (1.0, (1.0 - ((_adj.get_value()+_adj.get_page_size()) / 127.0)) * height());
 		double scroomer_bottom = (1.0 - (_adj.get_value () / 127.0)) * height();
 		double edge = 5. * UIConfiguration::instance().get_ui_scale();
+		double ignore;
+
+		draw_transform (ignore, scroomer_top);
+		draw_transform (ignore, scroomer_bottom);
 
 		if (evy > scroomer_top - edge && evy < scroomer_top + edge){
 			if (_scroomer_state != TOP) {