Dark theme lost in preview window in 1.15.8

[bbhtt]

1.15.7:

1.15.8:

I'm guessing it's from eb0ce63

[lwindolf]

Reproduced

[lwindolf]

Main problem here is that there is no way anymore to access the theme colors. The only way I can currently imagine turning the web view dark is by using a CSS invert filter.

[lwindolf]

Looking at devhelp they ignore the theme and just provide two solarized CSS styles. Doing this sounds easy but it will always more or less mismatch the theme colors.