add gui.escape_markup

src/graphics/ui/markdown.cpp

@@ -1,7 +1,5 @@
 #include "markdown.hpp"
 
-#include <sstream>
-
 #include "graphics/core/Font.hpp"
 
 using namespace markdown;
@@ -66,6 +64,7 @@ Result<CharT> process_markdown(
                         pos++;
                         continue;
                 }
+                pos--;
             }
         } else if (first == '*') {
             if (pos + 1 < source.size() && source[pos+1] == '*') {