Move hand cursor for buttons to reboot

[MartijnCuppens]

Fixes #26998, fixes #22693

• This PR adds a hand cursor for all buttons
• Adds $enable-hand-cursor-for-buttons variable which allows developers to still use the default cursor for all buttons.
• Adds a reset button example to the reboot page
• Moved all the separated declarations to scss/_reboot.scss.

Closes #25598

[patrickhlauke]

This looks tidy to me (though I bet people still won't be happy, or start asking why we're not doing it for generic .btn applied to arbitrary elements as well...)

[ysds]

similar PR and discussion in #25598

[andresgalante]

@MartijnCuppens Thanks a lot, this is a good move IMO.
I'd change enable-hand-cursor-for-buttons to enable-pointer-cursor-for-buttons, what do you think?

[patrickhlauke]

@andresgalante yup, good catch...technically more accurate to say enable-pointer-cursor... (though i wonder if devs will be confused/not know that pointer in CSS actually results in the "hand")

[MartijnCuppens]

No problem, just changed it to $enable-pointer-cursor-for-buttons.

[patrickhlauke]

👍 ... @mdo what say you?

[XhmikosR]

@mdo: ping for review

[mdo]

Current selectors include :not(.disabled) as well as the disabled attribute. I don't think we can consolidate all these under a single attribute selector, nor can we move away from the component classes completely I'd think since many, if not most, of these apply to anchors as well.

[jacobmllr95]

Isn't this going to be available in v4.2?

[MartijnCuppens]

Current selectors include :not(.disabled) as well as the disabled attribute. I don't think we can consolidate all these under a single attribute selector, nor can we move away from the component classes completely I'd think since many, if not most, of these apply to anchors as well.

@mdo , this change won't affect the links, they will still have cursor: pointer unless a class .disabled is added to a.btn. The only thing this will change is that the button (and input buttons) will have cursor:pointer by default.

[andresgalante]

I think we should move this forward