Improve readability & layout for "newly arrived" mail (biffstate - true)

[RealRaven2000]

When using white / bright backgrounds for tabs, the option "highlight folders with new mail" can lead to difficulties reading folder names.

It look good on dark backgrounds / colored tabs with a certain maximal brightness. Since it is a default option it can generate accessibility issues though.

[RealRaven2000]

I decided to slightly change the style by using a text outline instead of text shadow, increasing the sunken shadow area and forcing the extra bold font, but while this is mostly ok it can still be undesired, so I also added a new option to switch off the text styling (while keeping the other part of the styling):

Switched off (bright background) - this will retain the original font color and not force it to be white:

Switched on (bright background):

Switched on (dark background):

This looks better with larger font sizes, as I believe there may still be some rendering issues with the -webkit-text-stroke CSS attribute.

Here is a test version for the new feature (I presume I will refine the final look for the font before release):

QuickFolders-mx-6.5.2pre21.zip

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To install version above download zip file and drag the file into Thunderbird Add-ons Manager (do not extract contents, it won't install like that) - also restart Thunderbird for this one so that the new style sheet will be loaded.

[RealRaven2000]

implemented in 6.6 - Published 21/07/2024