Fix bug downloading files with long names

[freddyaboulton]

Description

If the orig_name of a file is longer than 30 characters, the UI would truncate the name of the downloaded file to the first 30 characters. This causes the file extension to be ignored which can be a problem for some demos, like 3d object files, etc.

This is more noticeable now that we return tmp files with really long names

This PR

Main

Checklist:

• I have performed a self-review of my own code
• I have added a short summary of my change to the CHANGELOG.md
• My code follows the style guidelines of this project
• I have commented my code in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes

A note about the CHANGELOG

Hello 👋 and thank you for contributing to Gradio!

All pull requests must update the change log located in CHANGELOG.md, unless the pull request is labeled with the "no-changelog-update" label.

Please add a brief summary of the change to the Upcoming Release > Full Changelog section of the CHANGELOG.md file and include
a link to the PR (formatted in markdown) and a link to your github profile (if you like). For example, "* Added a cool new feature by [@myusername](link-to-your-github-profile) in [PR 11111](https://github.com/gradio-app/gradio/pull/11111)".

If you would like to elaborate on your change further, feel free to include a longer explanation in the other sections.
If you would like an image/gif/video showcasing your feature, it may be best to edit the CHANGELOG file using the
GitHub web UI since that lets you upload files directly via drag-and-drop.

[gradio-pr-bot]

All the demos for this PR have been deployed at https://huggingface.co/spaces/gradio-pr-deploys/pr-2929-all-demos

[dawoodkhan82]

I can't reproduce the issue on main. Even with the long file name, my file still saves with the extension.

[abidlabs]

I tested this by running python .\demo\model3D\run.py on main and I got the issue that the file wasn't saved with the extension. See:

Can also confirm that this PR fixes it for me:

I'm not sure what would explain the discrepancy for you since I assume you and @freddyaboulton are both testing on Macs. Maybe there's a browser difference (I used Edge)? Nevertheless, LGTM from my end