Support for smoother gradients

[diego-est]

Hello all!

Today I was trying out using different border gradients and a thing I noticed was that the gradients seem to skip some colors. This makes sense (seeing the comment in the default config supplied) since the gradients are based off CSS's linear-gradient. This means that the gradient smoothly interpolate colors that go from the from color to the to color. This makes it so that if you make a gradient between red and blue, the colors go from red, to grayish purple, to blue. The hues in between blue and red get skipped.

The way CSS gets around this is by letting you give linear-gradient more arguments. Those arguments being the extra colors that you want the gradient to pass through. As a consequence you can make it go through the missing hues you needed.

My question now is:

• Could there be support for something like what CSS does with the extra arguments to linear-gradient?
• Could there be support for a version of active/inactive-gradient that interpolates the hue of the color instead of the RGB values?

Thank you for your time reading this.

Here are some examples of what I mean:
linear-gradient(red, blue)

linear-gradient(red, orange, yellow, green, blue)

[YaLTeR]

I was thinking to leave the config syntax as is, but add the ability to use a custom border "background image" so to say (so you save the gradient or anything else in an image and it uses that), or maybe just a custom border shader. Because I don't imagine this is a very widespread need, and these options will allow maximum customizability for the people who want it.