On macOS, add documentEdited APIs

[amrbashir]

• Tested on all platforms changed
• Added an entry to CHANGELOG.md if knowledge of this change could be valuable to users
• Updated documentation to reflect any user-facing changes, including notes of platform-specific behavior
• Created or updated an example program if it would help users understand this functionality
• Updated feature matrix, if new features were added or implemented

Port of tauri-apps/tao@33fdeab

[kchibisov]

How does it work? Is it basically enable/disable prompt and there's no event attached to it that says that user is trying to close the window with edit? Do you get CloseRequested in that case?

Is that to prevent force close by the system, since winit app can ignore CloseRequested and emulate the dialog thingy?

[amrbashir]

I don't use macOS but I think it is just a hint to the user that this window has unsaved changes, see this image

[madsmtm]

Tested it, it has no effect on CloseRequested, is simply a visual indication (though that would be nice to document!). It looks as follows on macOS 10.14.6:

Normal:

Edited:

[madsmtm]

Thanks, will merge in a few hours once CI catches up