From 368e98336f6cbd0cf5aceba07fec0590c8a7f5a2 Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Thu, 23 Sep 2021 11:48:08 -0600
Subject: [PATCH] gtkmm2ext: if a CairoWidget is used in the canvas, we do not
 need to realize the Gtk::EventBox

This may be a breaking change, but seems ok from superficial testing.
---
 libs/gtkmm2ext/cairo_widget.cc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/libs/gtkmm2ext/cairo_widget.cc b/libs/gtkmm2ext/cairo_widget.cc
index a181512a3a..826c8c0471 100644
--- a/libs/gtkmm2ext/cairo_widget.cc
+++ b/libs/gtkmm2ext/cairo_widget.cc
@@ -360,6 +360,10 @@ CairoWidget::on_style_changed (const Glib::RefPtr<Gtk::Style>&)
 void
 CairoWidget::on_realize ()
 {
+	if (_canvas_widget) {
+		/* do not need a realized event box */
+		return;
+	}
 	Gtk::EventBox::on_realize();
 #ifdef __APPLE__
 	if (_nsglview) {