From 6a226c946996b369aa4bf3d5c49c2612983da91c Mon Sep 17 00:00:00 2001
From: Benjamin Nauck <benjamin@nauck.se>
Date: Tue, 4 Mar 2025 21:00:51 +0100
Subject: [PATCH] Gui: Workaround for lighting issue

---
 src/Gui/View3DSettings.cpp | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/src/Gui/View3DSettings.cpp b/src/Gui/View3DSettings.cpp
index 9976e29da9..b625158f0d 100644
--- a/src/Gui/View3DSettings.cpp
+++ b/src/Gui/View3DSettings.cpp
@@ -111,6 +111,29 @@ void View3DSettings::applySettings()
     OnChange(*lightSourcesGrp,"AmbientLightColor");
     OnChange(*lightSourcesGrp,"AmbientLightIntensity");
 
+    // Workaround
+    // Clear old settings that was used for a while in 1.1dev
+    // By clearing these settings, 1.0 will be able to run with same config file again
+    // For more info: https://github.com/FreeCAD/FreeCAD/issues/19880
+    // TODO: Remove when 1.1.0 is about to be released
+    if (hGrp->GetASCII("FillLightDirection").empty()) {
+        hGrp->RemoveBool("EnableHeadlight");
+        hGrp->RemoveUnsigned("HeadlightColor");
+        hGrp->RemoveASCII("HeadlightDirection");
+        hGrp->RemoveInt("HeadlightIntensity");
+        hGrp->RemoveBool("EnableBacklight");
+        hGrp->RemoveUnsigned("BacklightColor");
+        hGrp->RemoveASCII("BacklightDirection");
+        hGrp->RemoveInt("BacklightIntensity");
+        hGrp->RemoveBool("EnableFillLight");
+        hGrp->RemoveUnsigned("FillLightColor");
+        hGrp->RemoveASCII("FillLightDirection");
+        hGrp->RemoveInt("FillLightIntensity");
+        hGrp->RemoveUnsigned("AmbientLightColor");
+        hGrp->RemoveInt("AmbientLightIntensity");
+    }
+    // End of workaround
+
     OnChange(*hGrp,"NavigationStyle");
     OnChange(*hGrp,"OrbitStyle");
     OnChange(*hGrp,"Sensitivity");