AppKit/UIKit: Do not emit default state events upon window creation

[madsmtm]

In Winit, we generally do not emit events for the initial value of things on the window. Existing examples include ThemeChanged, ModifiersChanged, Moved, CursorMoved and so on. So let's not do that for ScaleFactorChanged, SurfaceResized and Focused either!

See also #2696 and #2585 for some of the history on Focused. I don't know what I was thinking in #2585 (comment), but it's clearly wrong, we don't need to emit Focused(false) since it's the default for all platforms.

Part of #2640.

• Tested on all platforms changed
• Added an entry to the changelog module if knowledge of this change could be valuable to users
• Updated documentation to reflect any user-facing changes, including notes of platform-specific behavior

[madsmtm]

This comment does not seem to be true any more, the code for the Windows backend to do this seems to have been removed.

[kchibisov]

As long as the values are the same as the user queried them at the point of create_window it should be fine to not emit those, since the events imply that something default got changed, when it clearly not changed.

[madsmtm]

I have updated since you looked to also remove the redundant Focused(false) event on macOS that I added myself in #2585 (comment).

[kchibisov]

The focus stuff was required before since it wasn't stated whether the window is focused by default or not, so some assumed yeS, others not, so it was a bit messy.

I know that right now we explicitly declare that the window is not focused by default.

[madsmtm]

Ah, nice, thanks!