Matthias Bruzek

Cannot navigate with MasterDetailPage inside modal

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## 🐛 Bug Report I want to have a `MasterDetailPage` nested in a modal, then navigate to a new detail page inside that modal. Trying to navigate will close the...

[WIP] Fix stack overflow in MvxFormsPagePresenter.BuildPageTree

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### :sparkles: What kind of change does this PR introduce? (Bug fix, feature, docs update...) Bug fix ### :arrow_heading_down: What is the current behavior? Stack overflow ### :new: What is...

fix 11853 - concurrency problem in ObservableItemsSource

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### Description of Change ### This PR is a refactoring of the classes `ObservableItemsSource` and `ObservableGroupedSource` for two reasons, 1. the workarounds that grew in these classes eventually lead to...