Fix false matches in getFileIdPath

Author: glankk

simplecpp.cpp

@@ -3278,6 +3278,13 @@ static std::string getFileIdPath(const std::map<std::string, simplecpp::TokenLis
         if (!match.empty()) {
             return match;
         }
+        // if the file exists but hasn't been loaded yet then we need to stop searching here or we could get a false match
+        std::ifstream f;
+        openHeader(f, relativeOrAbsoluteFilename);
+        if (f.is_open()) {
+            f.close();
+            return "";
+        }
     } else if (filedata.find(header) != filedata.end()) {
         return header;// system header that its file is already in the filedata - return that as is
     }