bad contrast in Thunderbird reminder window w/ Ambiant MATE in18.04

[nmaxx]

Using the Ambiant MATE theme from 18.04 the reminder dialog of Thunderbird is themed incorrectly - contrast of the textbox for a custom snooze duration is horrible (dark grey on dark grey - see screenshot, nevermind the transparency, that happened due to automatic fade-out when invoking screencapture).

In Ambiant MATE Dark it is themed properly (white on dark grey).

This issue did not happen in 16.04 where the Ambiant MATE theme had less dark elements.

[nmaxx (nmaxx)]

I just noticed that Thunderbird 60 is not affected by this issue, but that version is not yet in the Ubuntu repo.

[Martin Wimpress  (flexiondotorg)]

Sadly this is not something we can fix. Thunderbird needs to reference the correct style classes, which it now does in Thunderbird 6.0.