[bug] setFullscreen will make 'decorations' show in MacOS

[tauri-bot]

This issue has been upstreamed from tauri-apps/tauri#5115

Describe the bug

if we await appWindow.setDecorations(false) at first,

then we await appWindow.setFullscreen(true),

and call await appWindow.setFullscreen(false) after a few seconds,

still can see the 'decorations' in these time.

Reproduction

reproduction code is here.

please use fullscreen branch and run the app to see the effect.

Expected behavior

No response

Platform and versions

Environment
› OS: Mac OS 11.4.0 X64
› Node.js: 17.0.1
› npm: 8.1.0
› pnpm: Not installed!
› yarn: 1.22.17
› rustup: 1.25.1
› rustc: 1.63.0
› cargo: 1.63.0
› Rust toolchain: stable-aarch64-apple-darwin

Packages
Error only one package mangager should be used, but found npm and yarn

---

Cargo.tmol

[build-dependencies]
tauri-build = { version = "1.0.4", features = [] }

[dependencies]
serde_json = "1.0"
serde = { version = "1.0", features = ["derive"] }
tauri = { version = "1.0.5", features = ["api-all"] }

Stack trace

No response

Additional context

No response

[lucasfernog]

tao/src/platform_impl/macos/util/async.rs

Line 124 in 4524d5d

NSWindowStyleMask::NSTitledWindowMask | NSWindowStyleMask::NSResizableWindowMask;

[lucasfernog]

@wusyong any idea how to fix this one?

[wusyong]

@lucasfernog I don't think this is possible. I feel like most people want is inset buttons without title bar and the line.
#513 is exploring this but it's inactive now.