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0772a29824
This introduces new callback methods for IFocusableTree and IFocusableNode for providing a basis of synchronizing domain state with focus changes. It also introduces support for implementations of IFocusableTree to better manage initial state cases, especially when a tree is focused using tab navigation. FocusManager has also been updated to ensure functional parity between tab-navigating to a tree and using focusTree() on that tree. This means that tab navigating to a tree will actually restore focus back to that tree's previous focused node rather than the root (unless the root is navigated to from within the tree itself). This is meant to provide better consistency between tab and non-tab keyboard navigation. Note that these changes originally came from #8875 and are required for later PRs that will introduce IFocusableNode and IFocusableTree implementations.