[MacOS/iOS] Fixed incorrect color of RadioButton in Dark Mode using Default Control Template.

[dustin-wojciechowski]

Description of Change

The border color and fill colors of the RadioButton were not being resolved correctly due to it being unable to determine the application's current theme. I moved their initialization to the method where the ellipses are drawn.

Added test CorrectDefaultRadioButtonThemeColorsInLightAndDarkModes in AppThemeTests to validate that the Default Control Template for RadioButton was indeed producing the correct colors in light mode and dark mode.

Issues Fixed

Fixes #5931

[dnfadmin]

All CLA requirements met.

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[dustin-wojciechowski]

I implemented requested changes for outer ellipse as well as the checkmark. I also brought the changes over to the Tizen version, although I'm not a fan of repeating stuff across two files :(

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[mandel-macaque]

Minor, lets try to have the smaller number of strings in the assembly.

[PureWeen]

I realize it's a bit funky because of needing to test that old key. Is there a way we can consolidate this and the similar code below this block into an extension method?

if (normalEllipse.TrySetAppTheme(
   lightResourceKey: RadioButtonOuterEllipseStrokeLight,
   darkResourceKey: RadioButtonOuterEllipseStrokeDark,
   bindableProperty: Ellipse.StrokeProperty,
   defaultDark: SolidColorBrush.Black,
   defaultLight: SolidColorBrush.White,
   out var outerLight,
   out var outerDark))

I also wonder if we want to make this if statement an OR vs an AND.

If the user has only specified RadioButtonOuterEllipseStrokeLight then we probably still want this logic to run and then we'd just set the other side of the AppThemeBinding to whatever the default is?

[mattleibow]

I see this issue is related to color things, so maybe this is useful to test as well. #12805

[PureWeen]

@StephaneDelcroix is this the best way to retrieve this resource? It seems like we'd retrieve the static resource once the DataTemplate is realized and added to the visual tree, that way it can check all the merged dictionaries?

Like, ideally this could use
radioButton.TryGetResource right? That way if the resources are specified on the page or the RadioButton itself they'll work?

Just not sure off hand how to do that in the code.

[stcmz]

Could you also merge the fix for .net 7.0?