Avoid duplicate upload button in minimize-upload-bar

[ts-ke]

1. LINKED ISSUES:
   Closes Reuse GitHub’s native upload button in minimize-upload-bar #3714

2. TEST URLS:
   Avoid duplicate upload button in minimize-upload-bar #3724

3. SCREENSHOT:
   edit: update screenshots
   image for readme:

[fregante]

Thanks for the PR!

Both buttons do the same thing, so our button should also be removed.

Additionally, this should be part of minimize-upload-bar and not just an addition to Refined GitHub

[ts-ke]

@fregante sorry for misunderstanding. updated.

[fregante]

Much better, thanks!

From what I see, this feature can be simplified further:

1. The js file should only add a class on body in the init function
2. The CSS file might need to be updated to expect the class on the body element and then include form in each selector (but ideally a more specific class than that, considering that this applies to a specific widget and not just any form)

[fregante]

About 2: the previous selectors probably don’t need to be updated at all

[ts-ke]

1. thx. I missed that.
2. I find a class name candidate, js-previewable-comment-form. I have checked "new PR comments", "edit PR comments", "inline-code comments" and "review comments". They seem to be ok. That being said, I don't know all the forms affected by the previous selector so I may have missed a few. So, I cant ensure the new behavior will match to old one. Is it ok?

[fregante]

Our class needs to be added on body.

Then that form class needs to be used to select the form in your new selector.

The number of forms changes on the page, so the loop will not include all of them.

[ts-ke]

@fregante Thank you for reviewing. I have tried to address the problem. Can you check if I have understood correctly?

[fregante]

Looks about right!

[fregante]

This has no effect and is not necessary

Suggested change

margin: 0;