[two_dimensional_scrollables] Fix TreeView null dereference during paint #9103
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Collapsing a node when there were other nodes offscreen was causing an unexpected null dereference during painting. This PR fixes the bug and adds a test. The bug was caused by erroneous computation of the max vertical scroll extent. Previously, the code computed this considering only scroll extent in the trailing (down) direction; it may also be the case that there is a larger scroll extent in the leading (up) direction. The miscalculation resulted in subsequent error computing the first visible row as a row that is actually offscreen, and thus does not have a render box. The row render box is asserted to be non-null during painting. Fixes flutter/flutter#149182 and flutter/flutter#164981
Piinks
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Apr 17, 2025
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Hey @tdenniston welcome! Thank you for finding and fixing this! Just a small nit to resolve the failing test below:
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@Piinks Thanks for the fast review! LMK of other changes, or if I need to squash the commits. |
Piinks
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Apr 30, 2025
MitchellGoodwin
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Apr 30, 2025
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flutter/packages@1f069a7...8d01cd9 2025-04-30 [email protected] [two_dimensional_scrollables] Fix TreeView null dereference during paint (flutter/packages#9103) If this roll has caused a breakage, revert this CL and stop the roller using the controls here: https://autoroll.skia.org/r/flutter-packages-flutter-autoroll Please CC [email protected] on the revert to ensure that a human is aware of the problem. To file a bug in Flutter: https://github.com/flutter/flutter/issues/new/choose To report a problem with the AutoRoller itself, please file a bug: https://issues.skia.org/issues/new?component=1389291&template=1850622 Documentation for the AutoRoller is here: https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md
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flutter/packages@1f069a7...8d01cd9 2025-04-30 [email protected] [two_dimensional_scrollables] Fix TreeView null dereference during paint (flutter/packages#9103) If this roll has caused a breakage, revert this CL and stop the roller using the controls here: https://autoroll.skia.org/r/flutter-packages-flutter-autoroll Please CC [email protected] on the revert to ensure that a human is aware of the problem. To file a bug in Flutter: https://github.com/flutter/flutter/issues/new/choose To report a problem with the AutoRoller itself, please file a bug: https://issues.skia.org/issues/new?component=1389291&template=1850622 Documentation for the AutoRoller is here: https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md
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Collapsing a node when there were other nodes offscreen was causing an unexpected null dereference during painting. This PR fixes the bug and adds a test.
The bug was caused by erroneous computation of the max vertical scroll extent. Previously, the code computed this considering only scroll extent in the trailing (down) direction; it may also be the case that there is a larger scroll extent in the leading (up) direction.
The miscalculation resulted in subsequent error computing the first visible row as a row that is actually offscreen, and thus does not have a render box. The row render box is asserted to be non-null during painting.
Fixes flutter/flutter#149182 and flutter/flutter#164981
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[shared_preferences]pubspec.yamlwith an appropriate new version according to the pub versioning philosophy, or I have commented below to indicate which version change exemption this PR falls under1.CHANGELOG.mdto add a description of the change, following repository CHANGELOG style, or I have commented below to indicate which CHANGELOG exemption this PR falls under1.///).If you need help, consider asking for advice on the #hackers-new channel on Discord.
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