From 0fa3bc21d2e2d81e57a84e6ccbbe00d5e371179b Mon Sep 17 00:00:00 2001
From: Dimitri van Heesch <doxygen@gmail.com>
Date: Wed, 5 Aug 2020 15:35:47 +0200
Subject: Fix for markdown emphasis processing regression.

Prevent <TT>__BLA</TT> .... <TT>BLA__</TT> from being detected as an
emphasis section and causing the wrong output.
---
 src/markdown.cpp | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/src/markdown.cpp b/src/markdown.cpp
index 86727a9..458e295 100644
--- a/src/markdown.cpp
+++ b/src/markdown.cpp
@@ -159,7 +159,7 @@ int Trace::s_indent = 0;
 // is character at position i in data an escape that prevents ending an emphasis section
 // so for example *bla (*.txt) is cool*
 #define ignoreCloseEmphChar(i) \
-  (data[i]=='('  || data[i]=='{' || data[i]=='[' || data[i]=='<' || \
+  (data[i]=='('  || data[i]=='{' || data[i]=='[' || (data[i]=='<' && data[i+1]!='/') || \
    data[i]=='\\' || \
    data[i]=='@')
 
@@ -356,12 +356,13 @@ int Markdown::findEmphasisChar(const char *data, int size, char c, int c_size)
   {
     while (i<size && data[i]!=c    && data[i]!='`' &&
                      data[i]!='\\' && data[i]!='@' &&
+                     !(data[i]=='/' && data[i-1]=='<') && // html end tag also ends emphasis
                      data[i]!='\n') i++;
     //printf("findEmphasisChar: data=[%s] i=%d c=%c\n",data,i,data[i]);
 
     // not counting escaped chars or characters that are unlikely
     // to appear as the end of the emphasis char
-    if (i>0 && ignoreCloseEmphChar(i-1))
+    if (ignoreCloseEmphChar(i-1))
     {
       i++;
       continue;
@@ -430,6 +431,10 @@ int Markdown::findEmphasisChar(const char *data, int size, char c, int c_size)
         i++;
       }
     }
+    else if (data[i-1]=='<' && data[i]=='/') // html end tag invalidates emphasis
+    {
+      return 0;
+    }
     else if (data[i]=='\n') // end * or _ at paragraph boundary
     {
       i++;
-- 
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