CollectionView causes invalid measurements on Android rotation

[jump32]

Description

See attached githib for repo project.

When running the attached Android app on a simulator. The page initially looks correct. (Click Load)

After rotation however, the second row is displayed incorrectly.

In addition, in the debug output you can see some incorrect measure values of 390451572 x 390451572

And sometimes, after rotation, the app gets caught in a continuous Measure / Layout sequence that only stops when you rotate back to the original orientation.

Using Nightly - 8.0.40-nightly.10515

Steps to Reproduce

• Run repo project on Android.
• Click Load button.
• Rotate device.
• Scroll tiles up slightly to see second row.
• Observe broken layout.
• (In debugger) Observe random measure calls of 390451572 x 390451572

Link to public reproduction project repository

https://github.com/jump32/maui-app-collection-view-issue

Version with bug

Nightly / CI build (Please specify exact version)

Is this a regression from previous behavior?

Not sure, did not test other versions

Last version that worked well

Unknown/Other

Affected platforms

Android

Affected platform versions

No response

Did you find any workaround?

It is possible that switching the Collection View to ItemSizingStrategy="MeasureAllItems".

Possible. But highly undesirable.

Relevant log output

Measure 184.36363636363637 x ∞
Measure 184.36363636363637 x ∞
ArrangeChildren {X=0 Y=0 Width=184.36363636363637 Height=276.72727272727275}
ArrangeChildren {X=0 Y=0 Width=184.36363636363637 Height=276.72727272727275}
Measure 390451572 x 390451572
Measure 390451572 x 390451572
ArrangeChildren {X=0 Y=0 Width=184.36363636363637 Height=276.72727272727275}
ArrangeChildren {X=0 Y=0 Width=184.36363636363637 Height=276.72727272727275}
Measure 390451572 x 390451572
Measure 390451572 x 390451572
ArrangeChildren {X=0 Y=0 Width=184.36363636363637 Height=276.72727272727275}
ArrangeChildren {X=0 Y=0 Width=184.36363636363637 Height=276.72727272727275}
Measure 184.36363636363637 x ∞
Measure 184.36363636363637 x ∞
ArrangeChildren {X=0 Y=0 Width=184.36363636363637 Height=276.72727272727275}
ArrangeChildren {X=0 Y=0 Width=184.36363636363637 Height=276.72727272727275}
Measure 390451572 x 390451572
Measure 390451572 x 390451572
ArrangeChildren {X=0 Y=0 Width=184.36363636363637 Height=276.72727272727275}
ArrangeChildren {X=0 Y=0 Width=184.36363636363637 Height=276.72727272727275}
Measure 390451572 x 390451572
Measure 390451572 x 390451572
ArrangeChildren {X=0 Y=0 Width=184.36363636363637 Height=276.72727272727275}
ArrangeChildren {X=0 Y=0 Width=184.36363636363637 Height=276.72727272727275}
Measure 184.36363636363637 x ∞
Measure 184.36363636363637 x ∞
ArrangeChildren {X=0 Y=0 Width=184.36363636363637 Height=276.72727272727275}
ArrangeChildren {X=0 Y=0 Width=184.36363636363637 Height=276.72727272727275}
Measure 390451572 x 390451572
Measure 390451572 x 390451572
ArrangeChildren {X=0 Y=0 Width=184.36363636363637 Height=276.72727272727275}
ArrangeChildren {X=0 Y=0 Width=184.36363636363637 Height=276.72727272727275}
Measure 390451572 x 390451572
Measure 390451572 x 390451572
ArrangeChildren {X=0 Y=0 Width=184.36363636363637 Height=276.72727272727275}
ArrangeChildren {X=0 Y=0 Width=184.36363636363637 Height=276.72727272727275}
Measure 184.36363636363637 x ∞
Measure 184.36363636363637 x ∞
ArrangeChildren {X=0 Y=0 Width=184.36363636363637 Height=276.72727272727275}
ArrangeChildren {X=0 Y=0 Width=184.36363636363637 Height=276.72727272727275}
Measure 390451572 x 390451572
Measure 390451572 x 390451572
ArrangeChildren {X=0 Y=0 Width=184.36363636363637 Height=276.72727272727275}
ArrangeChildren {X=0 Y=0 Width=184.36363636363637 Height=276.72727272727275}
Measure 390451572 x 390451572
Measure 390451572 x 390451572
ArrangeChildren {X=0 Y=0 Width=184.36363636363637 Height=276.72727272727275}
ArrangeChildren {X=0 Y=0 Width=184.36363636363637 Height=276.72727272727275}
Measure 389.45454545454544 x ∞
Measure 389.45454545454544 x ∞
ArrangeChildren {X=0 Y=0 Width=389.45454545454544 Height=584.3636363636364}
ArrangeChildren {X=0 Y=0 Width=389.45454545454544 Height=584.3636363636364}
Measure 389.45454545454544 x ∞
Measure 389.45454545454544 x ∞
ArrangeChildren {X=0 Y=0 Width=389.45454545454544 Height=584.3636363636364}
ArrangeChildren {X=0 Y=0 Width=389.45454545454544 Height=584.3636363636364}
Measure 390451572 x 390451572
Measure 390451572 x 390451572
ArrangeChildren {X=0 Y=0 Width=184.36363636363637 Height=276.72727272727275}
ArrangeChildren {X=0 Y=0 Width=184.72727272727272 Height=276.72727272727275}

[Zhanglirong-Winnie]

Verified this issue with Visual Studio 17.10.0 Preview 4(8.0.20&8.0.40-nightly.10515). Can repro on Android platform with sample project.
https://github.com/jump32/maui-app-collection-view-issue

[davidortinau]

Verified fixed.