[Bug]: When downloading a file using the video tag, an extra character dot appears when saving the file!

[liulinboyi]

Preflight Checklist

• I have read the Contributing Guidelines for this project.
• I agree to follow the Code of Conduct that this project adheres to.
• I have searched the issue tracker for a bug report that matches the one I want to file, without success.

Electron Version

20.0.3

What operating system are you using?

Windows

Operating System Version

Windows 11

What arch are you using?

x64

Last Known Working Electron version

19.0.6

Expected Behavior

When the video tag was used to download files, the save type was normal.

Actual Behavior

When downloading a file using the video tag, an extra character dot appears when saving the file! It has two character dot in the file type.

Testcase Gist URL

https://gist.github.com/liulinboyi/2e687fbf07f0d9c836933817046ea043

Additional Information

I have a feeling that this bug exists from version 20.

[codebytere]

@mlaurencin maybe related to the save file changes 🤔

[qubicle]

This bug also exists in Electron 19.0.14

[zcbenz]

It seems to be related to #34723. /cc @mlaurencin

[codebytere]

Closed in #35618

[alienzhangyw]

Closed in #35618

@codebytere This fix was not merged into v21, the bug still exists in v21.1.1

[mlaurencin]

@alienzhangyw Thank you for the notice. The fix should be in place once this PR is merged.