* 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>
Fixes for #8092:
- Always round sizes up, not to the nearest pixel, thereby ensuring that `DesiredSize`s don't get rounded down where possible.
- Apply rounding to `Padding` and `BorderThickness` in measure pass as well as arrange pass, to ensure that `DesiredSize` takes this rounding into account.
#7735 introduced an internal container control which hosts the child, but it exposed this child in the logical tree, breaking any styles which relied on the `Viewbox.Child` being the logical child of the `Viewbox`.
Fix this by introducing a simple internal `ViewboxContainer` control as the container.