Refresh padding and text after a pixel density change (#59049)

[brunocramos]

Summary:

When an Android app handles density changes itself (density in android:configChanges), its surface is laid out again at the new density, but some mounted views keep sizes from the old one:

• Padding and overflow insets are sent to views in pixels, but only when their dp values change, which a density change usually doesn't do. A TextInput keeps its old pixel padding, so its text and placeholder can be clipped.
• Paragraph state only updates when the text, its attributes or its measured size change, so Text keeps the layout it built at the old density and draws at the old size.

With the new fixTextLayoutOnPixelDensityChange feature flag on, padding and overflow insets are re-sent when the pixel density changes (zero insets are skipped: they are zero pixels at any density), and paragraph state is rebuilt. Both text paths are covered: with enablePreparedTextLayout, the paragraph prepares a new layout at the new density (the prepared text cache is keyed by density) and its state now updates when only the density changed; without it, the state records the density too. The flag is off by default.

How to use: return true from your app's feature flag overrides, before React Native starts:

override fun fixTextLayoutOnPixelDensityChange(): Boolean = true

Changelog:
[Internal]

Reviewed By: javache

Differential Revision: D124076552

[meta-codesync]

@brunocramos has exported this pull request. If you are a Meta employee, you can view the originating Diff in D124076552.

[meta-codesync]

This pull request has been merged in d026c0f.