SystemUI: improve qs tile scroll handling
- place detail view within bounds of expanded panel when it
goes beyond the bottom of the screen
- collapse qs panel when scrolling detail view (and letting go),
disallowing it to get stuck at weird states that cut off the detail view
Change-Id: I775c0bb0022893a6a79fab93fb6cd92ba67b7213
Signed-off-by: Roman Birg <roman@cyngn.com>
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