Menu bar ease-in animation

[jonasnordlund]

The menu bar currently seems to use a fixed speed opening effect while the official WinUI control uses an ease-in style animation (very fast from the start and then slowing down slightly) that is also looking to be of a bit higher framerate than the current one.

Would be nice to see enhanced alignment with the official control here if this can be done well with WPF animations?

Also, when a menu is opened and you move your mouse to another top menu item, that menu will then do its open animation once more in WinUI, while the WPFUI version shows it in an open state right from the start.

Example below. (I think it's more visible in practice than in a GIF animation)