Add option to show fallback colors on the sliders

[llakala]

Would be nice to see what the fallback color would be for a given value

[ai]

If you select hex output, it will be always fallback

[llakala]

Really? Not what I'm seeing:
image

[ai]

What do you mean by fallback color in this case?

I mean, that fallback color is the closest sRGB (old monitors) colors when you choose P3 color (new monitors).

Something like here: https://oklch.com/#74.41,0.192,54,100

In your case, you choose sRGB safe color, so you don’t need fallback.

[llakala]

Oh, I meant that the sliders would display the fallback colors for a given value. Currently, the fallback is limited to when you have the color selected. I was saying it'd be useful to be able to see what the fallback color would be on the slider.

[ai]

You mean P3 color on top and sRGB fallback on the bottom?

[ai]

Done 24edca2

sRGB fallback above and P3 below (it is better to check in real app, since image has P3 → sRGB reduction).