[net7.0] [windows] fix memory leak when CollectionView.ItemsSource changes#13648
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[net7.0] [windows] fix memory leak when CollectionView.ItemsSource changes#13648
CollectionView.ItemsSource changes#13648Conversation
Fixes: #13393 Context: https://github.com/ivan-todorov-progress/maui-collection-view-memory-leak-bug Debugging the above sample, I found that `ItemsView._logicalChildren` grew indefinitely in size if you replace a `CollectionView`'s `ItemsSource` over and over. I could fix this by creating a new `internal` `ItemsView.ClearLogicalChildren()` method and call it from the Windows `ItemsViewHandler`. I could reproduce this issue in a Device Test running on Windows. It appears the problem does not occur on Android or iOS due to the recycling behavior of the underlying platforms. For example, Android calls `OnViewRecycled()` which calls `RemoveLogicalChild(view)`: * https://github.com/dotnet/maui/blob/53f6e393750a3df05b12fcde442daf3616c216f8/src/Controls/src/Core/Handlers/Items/Android/Adapters/ItemsViewAdapter.cs#L52-L57 * https://github.com/dotnet/maui/blob/53f6e393750a3df05b12fcde442daf3616c216f8/src/Controls/src/Core/Handlers/Items/Android/TemplatedItemViewHolder.cs#L37-L45 On Windows, we merely have a `ItemContentControl` and there is no callback for when things are recycled. We *do* get a callback for when the `FormsDataContext` value changes, so an option is to clear the list in this case. After this change, my test passes -- but it was already passing on iOS and Android.
Apparently iOS is only creating 1:
Assert.Equal() Failure\nExpected: 3\nActual: 1
jonathanpeppers
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Mar 2, 2023
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/azp run |
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Azure Pipelines successfully started running 2 pipeline(s). |
jsuarezruiz
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Mar 2, 2023
jsuarezruiz
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t/housekeeping ♻︎
area-controls-collectionview
mandel-macaque
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Mar 2, 2023
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/backport to release/7.0.2xx |
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Started backporting to release/7.0.2xx: https://github.com/dotnet/maui/actions/runs/4469316800 |
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Backport of #13530 to net7.0
/cc @PureWeen @jonathanpeppers