Submitting a patch is always a good idea, as it increases the chances of improvement eventually making it into MantisBT core. All contributions are welcome and greatly appreciated.

Patch submissions can be made in several ways. In the order of preference:

1. Send us a Pull Request on our Github repository [1]
2. Attach a GIT patch to the issue
3. Attach a Unified Diff, clearly specifying the patch's base release

Kindly avoid to upload entire modified PHP files.

Please make sure that your submissions adhere to our Coding Guidelines [2], if they don't your patch might be rejected.

[1] https://github.com/mantisbt/mantisbt
[2] http://www.mantisbt.org/wiki/doku.php/mantisbt:coding_guidelines

Thank you @atrol, I'll study guidelines and I'll send a pull request on git.