Remove firefox workaround for ::file-selector-button margin

[emilio]

As per https://bugzilla.mozilla.org/show_bug.cgi?id=1673895,
this workaround shouldn't be necessary in FF83+.

TODO:

• Remove workarounds for .form-control-sm & .form-control-lg

Preview: https://deploy-preview-32064--twbs-bootstrap.netlify.app/docs/5.0/forms/form-control/#file-input

[XhmikosR]

We support Firefox >= 60

bootstrap/.browserslistrc

Line 7 in 0766a09

Firefox >= 60

[emilio]

That pseudo-element is Firefox 82+, see the above bug.

[emilio]

cc @MartijnCuppens

[MartijnCuppens]

@emilio, this will be added to FF83 beta 9 I assume? Can we test it somewhere, because I can only download beta 8 from https://www.mozilla.org/en-US/firefox/channel/desktop/?

[emilio]

@MartijnCuppens yes, it should be in 83b9, but you can also test it on a Nightly build from https://nightly.mozilla.org

[MartijnCuppens]

LGTM in Nightly (Dutch preview):

In FF82, there will be a little more padding, but that's acceptable imo:

Thanks for the PR, @emilio!

[ffoodd]

Just to be sure @MartijnCuppens, following up @XhmikosR comment: I assume this screenshot is the intended look & feel for Firefox < 83?

[emilio]

That'd be FF <82, I guess.

[ffoodd]

≤ 82, < 83 :)

[MartijnCuppens]

I assume this screenshot is the intended look & feel for Firefox < 83?

For FF ≤ 81, yup!