From 5ba8f1c1b0b33810e56f4a990ee6b813a51180d7 Mon Sep 17 00:00:00 2001
From: Holger Schemel <info@artsoft.org>
Date: Sun, 20 Mar 2016 16:22:54 +0100
Subject: [PATCH] fixed forced screen redraw in every frame (again)

---
 src/tools.c | 11 +++++++----
 1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/src/tools.c b/src/tools.c
index 3948bcb1..552eef2f 100644
--- a/src/tools.c
+++ b/src/tools.c
@@ -506,8 +506,14 @@ static void PrintFrameTimeDebugging()
 
 void BackToFront()
 {
+  static int last_redraw_mask = REDRAW_NONE;
+
+  // force screen redraw in every frame to continue drawing global animations
+  // (but always use the last redraw mask to prevent unwanted side effects)
   if (redraw_mask == REDRAW_NONE)
-    return;
+    redraw_mask = last_redraw_mask;
+
+  last_redraw_mask = redraw_mask;
 
 #if 1
   // masked border now drawn immediately when blitting backbuffer to window
@@ -552,9 +558,6 @@ void BackToFront()
 
   redraw_mask = REDRAW_NONE;
 
-  // force screen redraw in every frame to continue drawing global animations
-  redraw_mask = REDRAW_FIELD;
-
 #if DEBUG_FRAME_TIME
   PrintFrameTimeDebugging();
 #endif
-- 
2.34.1