Thanks a lot! I had the same issue, and probably would have never figured out the solution on my own.
Cykelero
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In my tests, the attributedTitle property does have an effect, but if you set it too early in the tab's lifecycle, it gets reset. Setting it a bit later, it seems to properly stick.
However, despite what the docs state*, the title's font size and font color are incorrect, even when left unspecified: the font is slightly too large, and the color is the same for both selected and unselected tabs (and isn't correct for either).
* “Attributes that are left unspecified, including the font and foreground color, are automatically filled in using default values appropriate for the window tab”
Sure! Here's the first dialog:
And the second:
Of note, the second dialog only appears if you choose “Allow” in the first. If you instead choose “Always Allow”, the second dialog is skipped. (and the keychain read succeeds)