* Init
* Remove XY navigation cache as it's no use
* Use pooled collection for XY navigation
* Restructure code a bit, fix IScroller handling
* Init KeyboardNavigationTests_XY tests
* Simplify XYFocus.GetNextFocusableElement usage
* Minor fixes
* Add more tests
* Remove unused NuiKeyboardNavigationHandler
* Finalizing
* Fix tests
* Add TODO12
* Make XYFocusOptions a class
* Add TestServices.FocusableWindow and make KeyboardNavigationHandler lazy, as it can't be reused on multiple windows
* Fix KeyboardNavigationHandler events handling, when focus was not actually changed
* Add arrow key tests
* Replace XYFocusKeyboardNavigationMode with more flexible XYFocusNavigationModes, integrate with KeyDeviceType input types
* Make XY focus navigation less broken, when there is no starting focused control
* Several Android TV compatibility improvements
* Remap tizen Back button to Esc
* Introduce internal XYFocusHelpers
* Make ComboBox and AutoCompleteBox handle Key events only when it's needed
* Make TextBox handle Key events only when it's needed
* Ignore Alt+Down when XY navigation is enabled in CalendarDatePicker and SplitButton
* Rename IsAllowedXYNavigationMode
* Fix ButtonSpinner with XY navigation
* Implement a very simple focus engagement for GridSplitter and Slider
* Add failing unit test for scenario 1 in #11878.
* Set TabOnceActiveElement on realized container.
Fixes scenario 1 in #11878.
* Use TabOnceActiveElement to decide focused element.
Fixes scenario #3 in #11878.
* Add failing test for #13064
* Remove Content binding from ScrollViewer template.
Since #10803, the `ScrollContentPresenter.Content` binding is managed internally, not via a binding in the template.
* Assign owner before doing subscriptions.
Fixes#13064.
This was signalled for removal in #9553, but I was hesitant to do it because it will be in use by a lot of code in order to override `StyleKey`. Instead of removing it, deprecate it and provide a virtual `StyledElement.StyleKeyOverride` property as the supported way of overriding a control's style key.
Rather than using the `ISelectable` interface to communicate container selection from the `SelectingItemsControl` to the container, use the `SelectingItemsControl.IsSelected` attached property, setting it with `SetCurrentValue` so that bindings defined in a style or item container theme can override the selection. Required an extra virtual `ContainerForItemPreparedOverride` method on `ItemsControl`.
A lot still broken, in particular virtualization is completely removed.`ItemsPresenter` now no longer has an `Items` or `ItemTemplate` property; it detects when it's hosted in an `ItemsControl`. `IItemsPresenter` interface removed.
`SelectionModel` needs to subscribe to `CollectionChanged` on the items before `ItemsControl` in order for the selection to be correct when we come to setting the selected state.
Because `SelectionModel.Source` isn't subscribed during initialization in `ItemsChanged`, we also need to make sure we don't subscribe `ItemsControl` to the collection changes during initialization. Instead subscribe in `OnInitialized` (this requires a few tests to be rooted in order to be called).
Fixes#4293
Max Katz
Steven Kirk
Emmanuel Hansen
Steven Kirk
Giuseppe Lippolis
Takoooooo
Dariusz Komosinski
Benedikt Schroeder
Nikita Tsukanov