From 184ea443799cd27a1e3cd3989c03c183297df890 Mon Sep 17 00:00:00 2001
From: albert-github <albert.tests@gmail.com>
Date: Sun, 12 Apr 2020 19:17:34 +0200
Subject: Text show as formula when USE_MATHJAX=YES (#7697)

When having a line of code like:
```
callback_check = re.compile(r'([^\(]*\(.*)(\* *)(\).*\(.*\))')
```
this is seen as an incomplete formula when using MathJax, the `\(` is seen as start of a MathJax  formula.
Replacing the backslash by the corresponding code `&#92;` didn't work as this is already translated by the bowser and still picked up by MathJax, so we need `&zwj;` to separate the backslash and the bracket without any spacing.
---
 src/htmldocvisitor.cpp | 10 ++++++++++
 src/htmlgen.cpp        | 12 ++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/src/htmldocvisitor.cpp b/src/htmldocvisitor.cpp
index bb35cae..ea2dffb 100644
--- a/src/htmldocvisitor.cpp
+++ b/src/htmldocvisitor.cpp
@@ -2226,6 +2226,11 @@ void HtmlDocVisitor::filter(const char *str)
       case '<':  m_t << "&lt;"; break;
       case '>':  m_t << "&gt;"; break;
       case '&':  m_t << "&amp;"; break;
+      case '\\': if ((*p == '(') || (*p == ')'))
+                   m_t << "\\&zwj;" << *p++;
+                 else
+                   m_t << c;
+                 break;
       default:   m_t << c;
     }
   }
@@ -2247,6 +2252,11 @@ void HtmlDocVisitor::filterQuotedCdataAttr(const char* str)
       case '"':  m_t << "&quot;"; break;
       case '<':  m_t << "&lt;"; break;
       case '>':  m_t << "&gt;"; break;
+      case '\\': if ((*p == '(') || (*p == ')'))
+                   m_t << "\\&zwj;" << *p++;
+                 else
+                   m_t << c;
+                 break;
       default:   m_t << c;
     }
   }
diff --git a/src/htmlgen.cpp b/src/htmlgen.cpp
index ac42a6a..b157881 100644
--- a/src/htmlgen.cpp
+++ b/src/htmlgen.cpp
@@ -668,6 +668,10 @@ void HtmlCodeGenerator::codify(const char *str)
                      { m_t << "&lt;"; p++; }
                    else if (*p=='>')
                      { m_t << "&gt;"; p++; }
+		   else if (*p=='(')
+                     { m_t << "\\&zwj;("; m_col++;p++; }
+                   else if (*p==')')
+                     { m_t << "\\&zwj;)"; m_col++;p++; }
                    else
                      m_t << "\\";
                    m_col++;
@@ -702,6 +706,10 @@ void HtmlCodeGenerator::docify(const char *str)
                      { m_t << "&lt;"; p++; }
                    else if (*p=='>')
                      { m_t << "&gt;"; p++; }
+		   else if (*p=='(')
+                     { m_t << "\\&zwj;("; p++; }
+                   else if (*p==')')
+                     { m_t << "\\&zwj;)"; p++; }
                    else
                      m_t << "\\";
                    break;
@@ -1502,6 +1510,10 @@ void HtmlGenerator::docify(const char *str,bool inHtmlComment)
                      { t << "&lt;"; p++; }
                    else if (*p=='>')
                      { t << "&gt;"; p++; }
+		   else if (*p=='(')
+                     { t << "\\&zwj;("; p++; }
+                   else if (*p==')')
+                     { t << "\\&zwj;)"; p++; }
                    else
                      t << "\\";
                    break;
-- 
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