SliverGrid with zero childCount throws The "scrollExtent" is negative. #59663
Description
Code to Reproduce
GridView.builder(
shrinkWrap: true,
physics: NeverScrollableScrollPhysics(),
padding: EdgeInsets.only(top: 15),
gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
crossAxisCount: 1,
mainAxisSpacing: 10,
childAspectRatio: 2.1,
),
itemCount: 0,
itemBuilder: (context, index) {
return getWidget(index);
})
The itemCount parameter is, of course, dynamic, and in the rare situation that its set to 0, and the mainAxisSpacing is also defined, it throws an exception.
The exception doesn't occur if I remove the mainAxisSpacing value, OR if I increase the itemCount to something greater than 0.
Exception:
flutter: The following assertion was thrown during performLayout():
flutter: SliverGeometry is not valid: The "scrollExtent" is negative.
flutter: The RenderSliver that returned the offending geometry was: RenderSliverGrid#fe95d relayoutBoundary=up14 NEEDS-LAYOUT NEEDS-PAINT NEEDS-COMPOSITING-BITS-UPDATE:
flutter: creator: SliverGrid ← SliverPadding ← ShrinkWrappingViewport ← IgnorePointer-[GlobalKey#fd570] ←
flutter: Semantics ← _PointerListener ← Listener ← _GestureSemantics ←
flutter: RawGestureDetector-[LabeledGlobalKey<RawGestureDetectorState>#af9cf] ← _PointerListener ← Listener
flutter: ← _ScrollableScope ← ⋯
flutter: parentData: paintOffset=Offset(0.0, 15.0) (can use size)
flutter: constraints: SliverConstraints(AxisDirection.down, GrowthDirection.forward, ScrollDirection.idle,
flutter: scrollOffset: 0.0, remainingPaintExtent: Infinity, crossAxisExtent: 384.0, crossAxisDirection:
flutter: AxisDirection.right, viewportMainAxisExtent: Infinity, remainingCacheExtent: Infinity,
flutter: cacheOrigin: 0.0)
flutter: geometry: SliverGeometry(scrollExtent: -10.0, hidden, maxPaintExtent: -10.0)
flutter: no children current live
flutter:
flutter: The relevant error-causing widget was:
flutter: GridView
Side note: The widget tree looks like this: CustomScrollView -> SliverList -> Column -> GridView.builder
Flutter (Channel master, 1.18.0-10.0.pre)
Dart version 2.9.0 (build 2.9.0-3.0.dev a69cb6d700)
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Important issues not at the top of the work listError messages from the Flutter frameworkStack traces logged to the consoleIssues with https://api.flutter.dev/flutter/packages/flutter/material repository.Viewports, list views, slivers, etc.Found to occur in 3.3Found to occur in 3.7flutter/packages/flutter repository. See also f: labels.The issue has been confirmed reproducible and is ready to work on