This state is not actually invalid: it can happen when running an empty batch update of >1 value which causes new, empty batch update to run in a `PropertyChanged` handler triggered from the first batch update.
When a control was move from one parent container to another, and that move caused the new parent container to be laid out in a different position, a code path was taken which resulted in the `VisualNode` being present under both the old and new containers.
Ensure that the node is removed from its old parent in this case.
Fixes#7381Fixes#6103 (probably)
Previously the combinator state was lost when traversing nested selectors. To fix it, instead of running the parent selector in `NestingSelector.Evaluate`, return the parent selector with `MovePrevious`. This required `MovePrevious` to be aware of parent styles and because I had to change its signature, I also made it internal as it doesn't need to be a public API.
When DevTools was opened, all layout property values were being promoted to `LocalValue`s because the `_updatingFromControl` flag was not being set during initialization, causing the initial values to be written back out to the control as local values.
* Add Loaded/Unloaded events
* Don't allow OnLoaded() twice unless OnUnloaded() is called
* Call OnLoadedCore within Render()
* Call OnLoadedCore() from OnAttachedToVisualTreeCore by scheduling it on the dispatcher
* Improve comments
* Queue loaded events
* Make the loaded queue static
* Make more members static per review
* Make sure control wasn't already scheduling for Loaded event
* Add locks around HashSet usage for when enumerating
* Remove from loaded queue in OnUnloadedCore() as failsafe
* Make Window raise its own Loaded/Unloaded events
* Attempt to fix leak tests to work with Loaded events
* Make WindowBase raise its own Loaded/Unloaded events
* Move hotkey leak tests to the LeakTest project
* Address some code review comments
* Attempt at actually queueing Loaded events again
* Fix typo
* Minor improvements
* Update controls benchmark
Co-authored-by: Max Katz <maxkatz6@outlook.com>
Co-authored-by: Jumar Macato <16554748+jmacato@users.noreply.github.com>
Steven Kirk
Dan Walmsley
Max Katz
Luis von der Eltz
Lobster Uberlord
Benedikt Stebner
Tako
Yoh Deadfall
robloo
Tetedeiench
Oxc3