From 91ddcaecfaa65ce4996cc9cd23dfa89838a8872b Mon Sep 17 00:00:00 2001
From: Thomas Jentzsch <tjentzsch@yahoo.de>
Date: Thu, 16 Jul 2020 17:25:33 +0200
Subject: [PATCH] Prevent enabling phosphor when cycling through global options
 (fixes #672)

---
 src/emucore/Console.cxx | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/src/emucore/Console.cxx b/src/emucore/Console.cxx
index 1f828ee94..be2907fe9 100644
--- a/src/emucore/Console.cxx
+++ b/src/emucore/Console.cxx
@@ -525,8 +525,11 @@ void Console::changePhosphor(int direction)
 {
   int blend = BSPF::stringToInt(myProperties.get(PropType::Display_PPBlend));
 
-  blend = BSPF::clamp(blend + direction * 2, 0, 100);
-  myOSystem.frameBuffer().tiaSurface().enablePhosphor(true, blend);
+  if(direction)
+  {
+    blend = BSPF::clamp(blend + direction * 2, 0, 100);
+    myOSystem.frameBuffer().tiaSurface().enablePhosphor(true, blend);
+  }
 
   ostringstream val;
   val << blend;