[1.16] Default theme updates

[zadjii-msft]

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From discussion with @cinnamon-msft et. al.

• [ ] Dark theme by default (was system)
• [ ] tab.background: terminalBackground
• [ ] Change the tab row colors back to what they were pre-Controlsv2
  • This point I might be mis-remembering. I think the crux was "make the colors better", and we had freedom to do whatever we wanted.
  • The current dark tabRow.background is basically the same as the default scheme BG, and maybe that's good, maybe that's bad.
• [ ] tabRow.unfocusedBackground set to something sensible in the default themes as well.

The 🌶️ rejected ides:

• Default to mica on
  • Rejected cause this would disable vintage opacity
  • Rejected cause our Mica story isn't fleshed out yet
  • Rejected cause dark tabs in light OS theme with Mica titlebars has pretty low contrast overall.
• ... with a non-acrylic, transparent control, so that you'd get the mica termcontrol body.
  • see all the above.

[zadjii-msft]

🏗️ Work in progress 🏗️

origin	screenshot (focused/unforcused if available)	tab.background	tabRow.background	tabRow.unfocusedBackground	With terminalBackground & Campbell	Contrast (goal 3:1)
Edge Dark	(1.454:1 / 1.212:1)	#3b3b3b	#202020	#2e2e2e		1.2:1 / 1.44:1
Terminal (Controlsv1)		#0c0c0c	#333333	n/a		1.548:1
Terminal (Controlsv2)	(1.342:1)	#282828	#0a0a0a	n/a		1.012:1
BG from edge unfocused, inactive BG from controlsv1	n/a	terminalBackground	#2e2e2e	#333333		1.44:1 / 1.548:1
Light BG from edge unfocused, inactive BG from controlsv1	n/a	terminalBackground	#e8e8e8	#ffffff		15.9:1

Notes:

• Campbell's BG is #0c0c0c

[ghost]

:tada:This issue was addressed in #13743, which has now been successfully released as Windows Terminal Preview v1.16.252.:tada:

Handy links:

• Release Notes
• Store Download