ViewStyleProps border*Color

[chrisglein]

Split out from #2796
https://facebook.github.io/react-native/docs/0.59/view-style-props#borderbottomcolor

• borderRightColor
• borderBottomColor
• borderEndColor
• borderLeftColor
• borderStartColor
• borderTopColor

[chrisglein]

The immediate pressure on this has been relieved, so we may not need this for 0.64. However it's also something that coming from web is just expected. In XAML Border you can have per-side thickness on a border. Which effectively means you can show/hide sides. But you can't specify a different color per side. In order to do that you'd need multiple Border elements or maybe to drop down to Composition in some way to draw multiple parts without creating so many heavy-weight objects.

@rectified95, after coming up with some clever options for grafting borders onto Text where they weren't natively supported 1:1, any thoughts on this one?

[rectified95]

Unfortunately, this is a different problem. If XAML doesn't provide the needed properties, then we can't hack our way past it in JS like I did with Text borders.

[chrisglein]

Not something we plan to address on the Paper renderer as we move towards Fabric.
Fabric API completion for 'View' is tracked here: #11136 (and this is completed for Fabric)