feat(macOS): add `window.set_visible_on_fullscreen()`

[probablykasper]

Would allow for Spotlight-like panel windows.

Related:

• feat(macos): expose set_activation_policy tauri#2258
• Panel windows #136

StackOverflow answers for showing window over fullscreen app:

• https://stackoverflow.com/questions/23503943/add-nswindow-in-front-of-fullscreen-app
• https://stackoverflow.com/questions/29995376/show-nswindow-beneath-nsstatusitem-in-fullscreen

This might be how Electron implements it? https://github.com/electron/electron/blob/81c143318ba04c9aff2a5bcb80e4a1e3d55e019f/shell/browser/native_window_mac.mm#L1297-L1318

[probablykasper]

@srsholmes was talking about how this could work in tauri-apps/tauri#2258 (as well as behavior across multiple spaces, which idk if there should be another issue for?)

[amrbashir]

on hold until #185 is done

[probablykasper]

@amrbashir I don't think showing over fullscreen apps is necessarily the same as showing on all workspaces, though I don't know for sure

[amrbashir]

I guess that is true, it doesn't have to be coupled with set_visible_on_all_workspaces but it will be only for mac.
I will transfer to tao.

[srsholmes]

This can be achieved (at least on macos) by the work in #185. It might be possibly what the

      ns_window.setLevel_(10000);

is doing.

I havn't tested it without the setlevel, but I am able to have my tauri app show over full screen apps with the tweaks mentioned in that issue.

[ParthJadhav]

Hey @srsholmes @probablykasper :

#[tauri::command]
pub fn show_tauri_window(window: Window) {
    let ns_window = window.ns_window().unwrap() as id;
    unsafe {
        let mut collection_behavior = ns_window.collectionBehavior();
        collection_behavior |= NSWindowCollectionBehavior::NSWindowCollectionBehaviorCanJoinAllSpaces;
        window.show().unwrap();
        ns_window.setLevel_(10000);
    }
}

As suggested this should be able to show the window above any fullscreen application. But it doesn't do that on release versions. It works fine on dev but not on realease.

MacOS: Ventura
Cpu: M2