From f1bf3354c439c92503e713c969c6158d2724f406 Mon Sep 17 00:00:00 2001
From: Pepe Rivera <joriv@microsoft.com>
Date: Mon, 9 Dec 2019 13:30:39 -0800
Subject: [PATCH] Fix graph rendering of inequalities (#856)

* fix inequality rendering

* Add comment
---
 src/GraphControl/Control/Equation.cpp | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/GraphControl/Control/Equation.cpp b/src/GraphControl/Control/Equation.cpp
index f572ce7..838a1ba 100644
--- a/src/GraphControl/Control/Equation.cpp
+++ b/src/GraphControl/Control/Equation.cpp
@@ -404,7 +404,14 @@ namespace GraphControl
     wstring Equation::GetRequestHeader()
     {
         wstring expr{ Expression->Data() };
-        if (expr.find(L">=<") != wstring::npos)
+
+        // Check for unicode characters of less than, less than or equal to, greater than and greater than or equal to.
+        if (expr.find(L">&#x3E;<") != wstring::npos || expr.find(L">&#x3C;<") != wstring::npos || expr.find(L">&#x2265;<") != wstring::npos
+            || expr.find(L">&#x2264;<") != wstring::npos)
+        {
+            return L"<mrow><mi>plotIneq2D</mi><mfenced separators=\"\">"s;
+        }
+        else if (expr.find(L">=<") != wstring::npos)
         {
             return L"<mrow><mi>plotEq2d</mi><mfenced separators=\"\">"s;
         }