I've cobbled together a small/naïve script to add a drop shadow to some of the existing icons:

with-dropshadow.png

I think the icons are pretty readable on both the active/inactive list and the rich text input, although the shadow on the icon picker is a bit harsh. I think that can be remediated ...

TL;DR
The contrast of white virtual-signal icons on active selections and input fields could be improved.

What?
Currently, the white signal icons, like [virtual-signal=left-arrow] have poor readability when used in (active) text input fields, or when they're shown on active lists.

There are ...