Cannot customize window color on macos(m1,14.5 (23F79))

[BinaryRyan]

https://tauri.app/learn/window-customization/#macos-transparent-titlebar-with-custom-window-background-color

use tauri::{TitleBarStyle, WebviewUrl, WebviewWindowBuilder};

// Learn more about Tauri commands at https://tauri.app/develop/calling-rust/
#[tauri::command]
fn greet(name: &str) -> String {
    format!("Hello, {}! You've been greeted from Rust!", name)
}

#[cfg_attr(mobile, tauri::mobile_entry_point)]
pub fn run() {
    tauri::Builder::default()
        .plugin(tauri_plugin_opener::init())
        .setup(|app| {
            let win_builder = WebviewWindowBuilder::new(app, "main", WebviewUrl::default())
                .title("Transparent Titlebar Window")
                .inner_size(800.0, 600.0);

            #[cfg(target_os = "macos")]
            let win_builder = win_builder.title_bar_style(TitleBarStyle::Transparent);

            let window = win_builder.build().unwrap();

            #[cfg(target_os = "macos")]
            {
                use cocoa::appkit::{NSColor, NSWindow};
                use cocoa::base::{id, nil};

                let ns_window = window.ns_window().unwrap() as id;
                unsafe {
                    let bg_color = NSColor::colorWithRed_green_blue_alpha_(
                        nil,
                        50.0 / 255.0,
                        158.0 / 255.0,
                        163.5 / 255.0,
                        1.0,
                    );
                    ns_window.setBackgroundColor_(bg_color);
                }
            }

            Ok(())
        })
        .invoke_handler(tauri::generate_handler![greet])
        .run(tauri::generate_context!())
        .expect("error while running tauri application");
}

    Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.71s
     Running `target/debug/secterm`
thread 'main' panicked at src/lib.rs:22:46:
called `Result::unwrap()` on an `Err` value: WebviewLabelAlreadyExists("main")
stack backtrace:
   0: rust_begin_unwind
             at /rustc/90b35a6239c3d8bdabc530a6a0816f7ff89a0aaf/library/std/src/panicking.rs:665:5
   1: core::panicking::panic_fmt
             at /rustc/90b35a6239c3d8bdabc530a6a0816f7ff89a0aaf/library/core/src/panicking.rs:74:14
   2: core::result::unwrap_failed
             at /rustc/90b35a6239c3d8bdabc530a6a0816f7ff89a0aaf/library/core/src/result.rs:1700:5
   3: core::result::Result<T,E>::unwrap
             at /Users/ryan/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/src/rust/library/core/src/result.rs:1104:23
   4: secterm_lib::run::{{closure}}
             at ./src/lib.rs:22:26
   5: core::ops::function::FnOnce::call_once{{vtable.shim}}
             at /Users/ryan/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/src/rust/library/core/src/ops/function.rs:250:5
   6: <alloc::boxed::Box<F,A> as core::ops::function::FnOnce<Args>>::call_once
             at /Users/ryan/.rustup/toolchains/stable-aarch64-apple-darwin/lib/rustlib/src/rust/library/alloc/src/boxed.rs:2454:9
   7: tauri::app::setup
             at /Users/ryan/.cargo/registry/src/rsproxy.cn-8f6827c7555bfaf8/tauri-2.2.0/src/app.rs:2183:5
   8: tauri::app::App<R>::run::{{closure}}
             at /Users/ryan/.cargo/registry/src/rsproxy.cn-8f6827c7555bfaf8/tauri-2.2.0/src/app.rs:1148:25
   9: tauri_runtime_wry::handle_event_loop
             at /Users/ryan/.cargo/registry/src/rsproxy.cn-8f6827c7555bfaf8/tauri-runtime-wry-2.3.0/src/lib.rs:3641:7
  10: <tauri_runtime_wry::Wry<T> as tauri_runtime::Runtime<T>>::run::{{closure}}
             at /Users/ryan/.cargo/registry/src/rsproxy.cn-8f6827c7555bfaf8/tauri-runtime-wry-2.3.0/src/lib.rs:2863:7
  11: <tao::platform_impl::platform::app_state::EventLoopHandler<T> as tao::platform_impl::platform::app_state::EventHandler>::handle_nonuser_event::{{closure}}
             at /Users/ryan/.cargo/registry/src/rsproxy.cn-8f6827c7555bfaf8/tao-0.31.1/src/platform_impl/macos/app_state.rs:105:9
  12: tao::platform_impl::platform::app_state::EventLoopHandler<T>::with_callback
             at /Users/ryan/.cargo/registry/src/rsproxy.cn-8f6827c7555bfaf8/tao-0.31.1/src/platform_impl/macos/app_state.rs:79:7
  13: <tao::platform_impl::platform::app_state::EventLoopHandler<T> as tao::platform_impl::platform::app_state::EventHandler>::handle_nonuser_event
             at /Users/ryan/.cargo/registry/src/rsproxy.cn-8f6827c7555bfaf8/tao-0.31.1/src/platform_impl/macos/app_state.rs:100:5
  14: tao::platform_impl::platform::app_state::Handler::handle_nonuser_event
             at /Users/ryan/.cargo/registry/src/rsproxy.cn-8f6827c7555bfaf8/tao-0.31.1/src/platform_impl/macos/app_state.rs:208:11
  15: tao::platform_impl::platform::app_state::AppState::launched
             at /Users/ryan/.cargo/registry/src/rsproxy.cn-8f6827c7555bfaf8/tao-0.31.1/src/platform_impl/macos/app_state.rs:300:5
  16: tao::platform_impl::platform::app_delegate::did_finish_launching
             at /Users/ryan/.cargo/registry/src/rsproxy.cn-8f6827c7555bfaf8/tao-0.31.1/src/platform_impl/macos/app_delegate.rs:105:3
  17: <unknown>
  18: <unknown>
  19: <unknown>
  20: <unknown>
  21: <unknown>
  22: <unknown>
  23: <unknown>
  24: <unknown>
  25: <unknown>
  26: <unknown>
  27: <unknown>
note: Some details are omitted, run with `RUST_BACKTRACE=full` for a verbose backtrace.
thread 'main' panicked at core/src/panicking.rs:221:5:
panic in a function that cannot unwind
stack backtrace:
   0:        0x10192cecc - std::backtrace_rs::backtrace::libunwind::trace::h6285d60e8a2c022a
                               at /rustc/90b35a6239c3d8bdabc530a6a0816f7ff89a0aaf/library/std/src/../../backtrace/src/backtrace/libunwind.rs:116:5
   1:        0x10192cecc - std::backtrace_rs::backtrace::trace_unsynchronized::h21fc036d4b8dd7fe
                               at /rustc/90b35a6239c3d8bdabc530a6a0816f7ff89a0aaf/library/std/src/../../backtrace/src/backtrace/mod.rs:66:5
   2:        0x10192cecc - std::sys::backtrace::_print_fmt::h69654d1f9cd065f2
                               at /rustc/90b35a6239c3d8bdabc530a6a0816f7ff89a0aaf/library/std/src/sys/backtrace.rs:66:9
   3:        0x10192cecc - <std::sys::backtrace::BacktraceLock::print::DisplayBacktrace as core::fmt::Display>::fmt::h7adefaad4a31afc0
                               at /rustc/90b35a6239c3d8bdabc530a6a0816f7ff89a0aaf/library/std/src/sys/backtrace.rs:39:26
   4:        0x10194a694 - core::fmt::rt::Argument::fmt::h42151196bb7af094
                               at /rustc/90b35a6239c3d8bdabc530a6a0816f7ff89a0aaf/library/core/src/fmt/rt.rs:177:76
   5:        0x10194a694 - core::fmt::write::h381c0b0ce6ab972a
                               at /rustc/90b35a6239c3d8bdabc530a6a0816f7ff89a0aaf/library/core/src/fmt/mod.rs:1186:21
   6:        0x10192a3d0 - std::io::Write::write_fmt::h75af97148630d8d3
                               at /rustc/90b35a6239c3d8bdabc530a6a0816f7ff89a0aaf/library/std/src/io/mod.rs:1839:15
   7:        0x10192cd80 - std::sys::backtrace::BacktraceLock::print::h8baf33e22611de71
                               at /rustc/90b35a6239c3d8bdabc530a6a0816f7ff89a0aaf/library/std/src/sys/backtrace.rs:42:9
   8:        0x10192dca8 - std::panicking::default_hook::{{closure}}::h369c7295ef58c5b1
                               at /rustc/90b35a6239c3d8bdabc530a6a0816f7ff89a0aaf/library/std/src/panicking.rs:268:22
   9:        0x10192daec - std::panicking::default_hook::h50746358288a9d6a
                               at /rustc/90b35a6239c3d8bdabc530a6a0816f7ff89a0aaf/library/std/src/panicking.rs:295:9
  10:        0x10192e45c - std::panicking::rust_panic_with_hook::h7d795911432661cb
                               at /rustc/90b35a6239c3d8bdabc530a6a0816f7ff89a0aaf/library/std/src/panicking.rs:801:13
  11:        0x10192e0e8 - std::panicking::begin_panic_handler::{{closure}}::h36f15310ecbde379
                               at /rustc/90b35a6239c3d8bdabc530a6a0816f7ff89a0aaf/library/std/src/panicking.rs:667:13
  12:        0x10192d390 - std::sys::backtrace::__rust_end_short_backtrace::heed121414170e0c7
                               at /rustc/90b35a6239c3d8bdabc530a6a0816f7ff89a0aaf/library/std/src/sys/backtrace.rs:170:18
  13:        0x10192ddc8 - rust_begin_unwind
                               at /rustc/90b35a6239c3d8bdabc530a6a0816f7ff89a0aaf/library/std/src/panicking.rs:665:5
  14:        0x10196df5c - core::panicking::panic_nounwind_fmt::runtime::h5272f45982e012a1
                               at /rustc/90b35a6239c3d8bdabc530a6a0816f7ff89a0aaf/library/core/src/panicking.rs:112:18
  15:        0x10196df5c - core::panicking::panic_nounwind_fmt::h5d86a478a9d7437c
                               at /rustc/90b35a6239c3d8bdabc530a6a0816f7ff89a0aaf/library/core/src/panicking.rs:122:5
  16:        0x10196dfd4 - core::panicking::panic_nounwind::he171ad52d328e60b
                               at /rustc/90b35a6239c3d8bdabc530a6a0816f7ff89a0aaf/library/core/src/panicking.rs:221:5
  17:        0x10196e14c - core::panicking::panic_cannot_unwind::h2dd8cd735765e065
                               at /rustc/90b35a6239c3d8bdabc530a6a0816f7ff89a0aaf/library/core/src/panicking.rs:310:5
  18:        0x1016221f4 - tao::platform_impl::platform::app_delegate::did_finish_launching::h8a26e56f8e0aecb5
                               at /Users/ryan/.cargo/registry/src/rsproxy.cn-8f6827c7555bfaf8/tao-0.31.1/src/platform_impl/macos/app_delegate.rs:103:1
  19:        0x18ac63144 - <unknown>
  20:        0x18acf73d8 - <unknown>
  21:        0x18acf7320 - <unknown>
  22:        0x18ac31678 - <unknown>
  23:        0x18bd4e4e4 - <unknown>
  24:        0x18e4d4410 - <unknown>
  25:        0x18e4d41c0 - <unknown>
  26:        0x18e4d2714 - <unknown>
  27:        0x18e4d2310 - <unknown>
  28:        0x18bd77374 - <unknown>
  29:        0x18bd77168 - <unknown>
thread caused non-unwinding panic. aborting.

[FabianLars]

The first window without a "label" in tauri.conf.json will have the "main" label. In your rust code your window also has the "main" label but labels are IDs == unique. So if you remove the window from the config it will work.

[BinaryRyan]

            #[cfg(target_os = "macos")]
            {
                use cocoa::appkit::{NSColor, NSWindow};
                use cocoa::base::{id, nil};

                if let Some(window) = app.get_webview_window("main") {
                    let ns_window = window.ns_window().unwrap() as id;
                    unsafe {
                        let bg_color = NSColor::colorWithRed_green_blue_alpha_(
                            nil,
                            29.0 / 255.0, // R: 0.1137
                            28.0 / 255.0, // G: 0.1098
                            44.0 / 255.0, // B: 0.1725
                            1.0,          // Alpha: 1.0
                        );
                        println!("Window with label 'main' found.");
                        ns_window.setBackgroundColor_(bg_color);
                    }
                } else {
                    println!("Window with label 'main' not found.");
                }
            }

I found this Windows and set the color, but it doesn't work