[Bug]: dark theme does not invert html entities carrying bgcolor

[jdeluyck]

Description

Testing Bulwark (as a FastMail replacement), I found several emails which were not being inverted correctly.
It seems to have to do with bgcolor attributes of html entities.

Steps to Reproduce

Upload .eml file in attachment - see also screenshots.

Expected Behavior

Expected it to match Fastmails rendering.

Actual Behavior

Items not inverted

Bulwark Version

1.7.8

Stalwart Mail Server Version

0.16.14

Browser

Firefox

Operating System

Linux

Screenshots / Screen Recording

Bulwark:

Fastmail:

Relevant Logs or Error Output

Additional Context

No response