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Valentin Shergin
ca6700f3c3
Summary: In W3C standard, `zIndex` prop can have `auto` value which is the default. In classic React Native and in Fabric before this diff, the default value was `0`. The only difference between `auto` and `0` is that nodes with `auto` do not form stacking context whereas nodes with `0` (or any other numeric value) do. This worked fine in pre-Fabric RN where every view always formed staking context but in Fabric we need to finally implement it right. https://developer.mozilla.org/en-US/docs/Web/CSS/z-index https://stackoverflow.com/a/57892072/496389 Changelog: [Internal] Fabric-specific internal change. Reviewed By: sammy-SC Differential Revision: D22403383 fbshipit-source-id: 6532d180a00f22bde763e3ebadd6683b344a0672