Fix an issue where WinMerge crashes depending on the filename when ge…

…nerating a file compare report. (#1319)

- Fix to properly resize the buffer of the replaced character string in the process of replacing the special characters contained in the file name with the HTML entities.

Src/markdown.cpp

@@ -208,7 +208,7 @@ std::string CMarkdown::Entities(const std::string& v)
 			{
 				ptrdiff_t i = p - &ret[0];
 				ptrdiff_t j = q - &ret[0];
-				size_t b = v.length();
+				size_t b = ret.length();
 				ret.resize(b + cchValue - 1);
 				p = &ret[0] + i;
 				q = &ret[0] + j;