fix(View): change default zIndex from 0 to 'auto' #2808
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Description
Changes the default
zIndexof View from0to'auto'to fix z-index layering issues with nested components.Problem
Setting
zIndex: 0on a positioned element establishes a new local CSS stacking context, which isolates child elements with z-index values inside their parent View. This forces developers to manually add z-index to all nested Views just to make overlapping elements work correctly, as described in #2741.Solution
By using
zIndex: 'auto'instead, View no longer establishes a stacking context by default. This allows nested elements with z-index to participate in the parent stacking context and layer naturally relative to other positioned elements in the document tree, without requiring manual z-index management throughout the component hierarchy.Changes
zIndexfrom0to'auto'in View's default stylesImpact
This is a behavioral change that makes z-index work more intuitively and aligns better with React Native's behavior. Existing apps that don't rely on the stacking context isolation (uncommon) should see no difference. Apps that struggled with z-index layering will now work correctly without workarounds.
Closes #2741