Let scrollbars avoid obstructing slivers and media query paddings #13253
Description
Internal: b/144318472
Consider a CustomScrollView with a SliverAppBar and a SliverList and the user wants a scrollbar showing the position inside the SliverList's contents only.
Let the SliverAppBar report SliverGeometry describing its obstructing and max obstructing extends. Let that get aggregated by the scrollable and bubbled up with a scroll notification so the scrollbar can start below the obstructing area.
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High-priority issues at the top of the work listNothing broken; request for a new capabilityAffects or could affect many people, though not necessarily a specific customer.flutter/packages/flutter/cupertino repositoryflutter/packages/flutter/material repository.Viewports, list views, slivers, etc.flutter/packages/flutter repository. See also f: labels.