Variable .btn and .form-control font sizes

[MartijnCuppens]

Closes #26907.

[andresgalante]

Hi @MartijnCuppens, thanks a lot! I like the idea of having variables to change the font size of the btns. Having said that there are 2 things that I'd change on this PR:

• As @isychev mention on #26907 there should be a relation between the font size of the btn and the font size of the input, the same way we do paddings for example.

• This PR changes the font-size of the sm and lg btns and it'd produce a regresion. I suggest creating variables but defining them as as $font-size-base. Therefore we keep the same aspect, we don't break authors implementations but we open an option to style them.

Does it make sense?

[MartijnCuppens]

Thanks for the review @isychev and @andresgalante. It makes sense to keep the btn and input font sizes in sync, I'll look into this.

This PR changes the font-size of the sm and lg btns and it'd produce a regresion. I suggest creating variables but defining them as as $font-size-base. Therefore we keep the same aspect, we don't break authors implementations but we open an option to style them.

Right now .btn-sm and .btn-lg buttons use $font-size-sm and $font-size-lg as font-size, are you suggesting to change this to $font-size-base, Andres?

[andresgalante]

Yes, I am suggesting something like:

// define inputs and btns to be the same
$input-btn-font-size: $font-size-base;
$input-btn-font-size-sm: $input-btn-font-size;
$input-btn-font-size-lg: $input-btn-font-size;

// and have control over the btns too
$btn-font-size: $input-btn-font-size;
$btn-font-size-sm: $input-btn-font-size-sm;
$btn-font-size-lg: $input-btn-font-size-lg;

Makes sense?

[MartijnCuppens]

Hmm, wouldn't that be a breaking change? All the font-sizes of for the .form-control elements with sizing classes would be the same if we did that?
https://getbootstrap.com/docs/4.1/components/forms/#sizing

Wouldn't this make more sense?

// define inputs and btns to be the same
$input-btn-font-size: $font-size-base;
$input-btn-font-size-sm: $font-size-sm;
$input-btn-font-size-lg: $font-size-lg;

// and have control over the btns too
$btn-font-size: $input-btn-font-size;
$btn-font-size-sm: $input-btn-font-size-sm;
$btn-font-size-lg: $input-btn-font-size-lg;

[MartijnCuppens]

I've updated my PR to keep the .btn and .form-control font sizes in sync to avoid inconsistencies between them. @andresgalante, can you review the changes I made?

I've also updated $custom-select-font-size-sm and $custom-select-font-size-lg. This will cause conflicts if we merge this together with #26585. Shall I merge the changes from that PR in this PR?

[isychev]

I think that this is a good idea. The main thing that all worked by default, If someone wants to change the size of the buttons, he must understand the risks. It may be worth adding a comment "Caution. Resizing only buttons can affect layout"

[andresgalante]

👍 Thanks a lot @MartijnCuppens !

@mdo I'll add it to 4.2 since it's a new feature.