From 5974abe351bf86d7d6f3441dc7eaac05d3b39cc8 Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Mon, 28 Mar 2022 20:16:22 +0200
Subject: [PATCH] Fem: in case the range collapses to a single value expand it
 to a valid range with +/- eps

---
 src/Mod/Fem/Gui/ViewProviderFemPostObject.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/Mod/Fem/Gui/ViewProviderFemPostObject.cpp b/src/Mod/Fem/Gui/ViewProviderFemPostObject.cpp
index 3df2fb60ed..00527167da 100644
--- a/src/Mod/Fem/Gui/ViewProviderFemPostObject.cpp
+++ b/src/Mod/Fem/Gui/ViewProviderFemPostObject.cpp
@@ -477,6 +477,10 @@ void ViewProviderFemPostObject::WritePointData(vtkPoints* points, vtkDataArray*
 void ViewProviderFemPostObject::setRangeOfColorBar(double min, double max)
 {
     try {
+        if (min >= max) {
+            min = max - 10 * std::numeric_limits<float>::epsilon();
+            max = max + 10 * std::numeric_limits<float>::epsilon();
+        }
         m_colorBar->setRange(min, max);
     }
     catch (const Base::ValueError& e) {