From 141a06334ecd92286b731125589832f161f03e11 Mon Sep 17 00:00:00 2001
From: Po Lu <luangruo@yahoo.com>
Date: Sat, 1 Jan 2022 10:24:38 +0000
Subject: [PATCH] Fix expose events in non-double-buffered child frames on
 Haiku

* src/haiku_support.cc (EmacsShow): Set shown_flag to 1 only if
this view is double buffered.
(TearDownDoubleBuffering): Clear shown_flag.
---
 src/haiku_support.cc | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/haiku_support.cc b/src/haiku_support.cc
index 6a270d338a2..e1aaf835689 100644
--- a/src/haiku_support.cc
+++ b/src/haiku_support.cc
@@ -739,7 +739,7 @@ public:
 	was_shown_p = true;
       }
 
-    if (this->parent)
+    if (this->parent && offscreen_draw_view)
       shown_flag = 1;
     Show ();
     if (this->parent)
@@ -994,6 +994,8 @@ public:
 	offscreen_draw_view = NULL;
 	delete offscreen_draw_bitmap_1;
 	offscreen_draw_bitmap_1 = NULL;
+
+	shown_flag = 0;
       }
    }
 
-- 
2.39.2