Search view checkboxes use greyscale aa

[sbatten]

not sure if this is equivalent to #85589 since the text in the box is using proper SPAA

refs #85143

[deepak1556]

@sbatten this one is different, the textarea in the other issue is affected by the system font. I have an idea about the upstream issue thats causing it. Will post updates there tomorrow.

[bpasero]

This came in from @misolori via c109f9a. It looks like the background color is set to transparent which likely causes this.

[miguelsolorio]

I'll update this so it's only using a background when set.

[miguelsolorio]

After looking into this, the transparent border/background is not affecting the grayscale, I added a new icon (plain) on a separate DOM node, and it is also affected:

What's interesting is if I play with the positioning, there's a threshold where it will switch from aa to grayscale, so it appears that the input is causing the grayscale:

And hiding the input removes the grayscale aa: