Add Visuals::interact_cursor

[zkrising]

When hovering over an egui::Button, the cursor should change to a PointingHand. This is consistent with the buttons in most other UIs (the browser, etc.)

Closes #3311.

[emilk]

This should be opt-in, set as an option in Visuals.

I personally prefer pointing-hand to mean "clicking here will bring you someplace else", which not all buttons do, but of course this is a matter of preference.

You should also consider if this should apply to other widgets too. Maybe you want anything that is clickable to have the pointing hand?

[zkrising]

Makes sense to me. I'll look into making this a visual option and take a look at other clickable widgets in egui. Should be committed by the end of the day.

Thanks for such a fast review!

[LoganDark]

#3311 (comment)

this is a web browser thing that absolutely does not belong on native controls! leave this up to the user please and do NOT use the pointing hand cursor by default. maybe a setting would be reasonable but not a default

[zkrising]

Sounds good to me! I'm putting this into an option now.

[zkrising]

This is now an option that is off by default. From what I can tell browsers don't invoke this behaviour when hovering over a checkbox or a radio button. It's just for normal buttons.

There's an argument to be made that things like collapsing_header should also inherit this behaviour, since they're button-ish (vscode would agree with me here, but things like <summary> disagree.)

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pointinghand_if_interactive is quite frankly a terrible name but I couldn't think of a better one. Totally open for any suggestions that suck less.

[LoganDark]

It's just for normal buttons.

Nope - it's only for hyperlinks. Sites override this for buttons, but for desktop UI elements this isn't common.

pointinghand_if_interactive is quite frankly a terrible name but I couldn't think of a better one. Totally open for any suggestions that suck less.

interact_cursor (or something like) and have it be an Option that can contain any cursor one would like?

[zkrising]

Nope - it's only for hyperlinks. Sites override this for buttons, but for desktop UI elements this isn't common.

Oh wow, yea. Everything I checked this on overrides that functionality. I guess I've just subconsciously gotten used to it and thought it was the default.

interact_cursor (or something like) and have it be an Option that can contain any cursor one would like?

Yeah this is a huge improvement. One sec.