渲染库捕获到异常
The following assertion was thrown during performLayout():
SliverGeometry is not valid: The "scrollExtent" is negative.
The RenderSliver that returned the offending geometry was: RenderSliverGrid#f9778 relayoutBoundary=up2 NEEDS-LAYOUT NEEDS-PAINT:
creator: SliverGrid ← MediaQuery ← SliverPadding ← Viewport ← IgnorePointer-[GlobalKey#15db4] ←
Semantics ← _PointerListener ← Listener ← _GestureSemantics ←
RawGestureDetector-[LabeledGlobalKey<RawGestureDetectorState>#30301] ← _PointerListener ← Listener
← ⋯
parentData: paintOffset=Offset(0.0, 0.0) (can use size)
constraints: SliverConstraints(AxisDirection.down, GrowthDirection.forward, ScrollDirection.idle,