From 71e085d82570496ff0077d7828f984e71cffe8de Mon Sep 17 00:00:00 2001
From: Paul Davis <paul@linuxaudiosystems.com>
Date: Mon, 18 Mar 2024 10:49:15 -0600
Subject: [PATCH] ensure that the canvas fully redraws after style/visibility
 events

---
 libs/canvas/canvas.cc       | 20 ++++++++++++++++++++
 libs/canvas/canvas/canvas.h |  2 ++
 2 files changed, 22 insertions(+)

diff --git a/libs/canvas/canvas.cc b/libs/canvas/canvas.cc
index 2721c6c96b..b2876d4a26 100644
--- a/libs/canvas/canvas.cc
+++ b/libs/canvas/canvas.cc
@@ -966,6 +966,9 @@ GtkCanvas::on_size_allocate (Gtk::Allocation& a)
 	}
 #endif
 
+	/* call to ensure that entire canvas is marked in the invalidation region */
+	queue_draw ();
+
 	/* x, y in a are relative to the parent. When passing this down to the
 	   root group, this origin is effectively 0,0
 	*/
@@ -1113,6 +1116,23 @@ GtkCanvas::on_scroll_event (GdkEventScroll* ev)
 	return deliver_event (reinterpret_cast<GdkEvent*>(&copy));
 }
 
+void
+GtkCanvas::on_style_changed (const Glib::RefPtr<Gtk::Style>& style)
+{
+	EventBox::on_style_changed (style);
+	/* call to ensure that entire canvas is marked in the invalidation region */
+	queue_draw ();
+}
+
+bool
+GtkCanvas::on_visibility_notify_event (GdkEventVisibility* ev)
+{
+	bool ret = EventBox::on_visibility_notify_event (ev);
+	/* call to ensure that entire canvas is marked in the invalidation region */
+	queue_draw ();
+	return ret;
+}
+
 /** Handler for GDK key press events.
  *  @param ev Event.
  *  @return true if the event was handled.
diff --git a/libs/canvas/canvas/canvas.h b/libs/canvas/canvas/canvas.h
index 75fcd9e495..c8d53a3e4f 100644
--- a/libs/canvas/canvas/canvas.h
+++ b/libs/canvas/canvas/canvas.h
@@ -270,6 +270,8 @@ protected:
 	bool on_motion_notify_event (GdkEventMotion *);
 	bool on_enter_notify_event (GdkEventCrossing*);
 	bool on_leave_notify_event (GdkEventCrossing*);
+	void on_style_changed (const Glib::RefPtr<Gtk::Style>&);
+	bool on_visibility_notify_event (GdkEventVisibility*);
 	void on_map();
 	void on_unmap();