From 2245d87875e7c7595acfb86b19c55fe6d802ba6e Mon Sep 17 00:00:00 2001
From: thrust26 <tjentzsch@yahoo.de>
Date: Thu, 2 Jul 2020 09:33:16 +0200
Subject: [PATCH] suppress fullscreen mode switches in Time Machine mode (fixes
 #670)

---
 src/emucore/FrameBuffer.cxx | 36 ++++++++++++++++++++++++------------
 1 file changed, 24 insertions(+), 12 deletions(-)

diff --git a/src/emucore/FrameBuffer.cxx b/src/emucore/FrameBuffer.cxx
index f2c3fc8f6..6ae234fa0 100644
--- a/src/emucore/FrameBuffer.cxx
+++ b/src/emucore/FrameBuffer.cxx
@@ -992,21 +992,33 @@ void FrameBuffer::setFullscreen(bool enable)
 // - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
 void FrameBuffer::toggleFullscreen(bool toggle)
 {
-  const bool isFullscreen = toggle ? !fullScreen() : fullScreen();
-
-  setFullscreen(isFullscreen);
-
-  if(myBufferType == BufferType::Emulator)
+  switch (myOSystem.eventHandler().state())
   {
-    ostringstream msg;
+    case EventHandlerState::LAUNCHER:
+    case EventHandlerState::EMULATION:
+    case EventHandlerState::PAUSE:
+    case EventHandlerState::DEBUGGER:
+    {
+      const bool isFullscreen = toggle ? !fullScreen() : fullScreen();
 
-    msg << "Fullscreen ";
-    if(isFullscreen)
-      msg << "enabled (" << refreshRate() << " Hz)";
-    else
-      msg << "disabled";
+      setFullscreen(isFullscreen);
 
-    showMessage(msg.str());
+      if (myBufferType != BufferType::Launcher)
+      {
+        ostringstream msg;
+
+        msg << "Fullscreen ";
+        if (isFullscreen)
+          msg << "enabled (" << refreshRate() << " Hz)";
+        else
+          msg << "disabled";
+
+        showMessage(msg.str());
+      }
+      break;
+    }
+    default:
+      break;
   }
 }