dear-imgui-winit 0.13.0

Winit platform backend for dear-imgui-rs
Documentation 
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#[cfg(test)]
pub(crate) mod test_sync {
    use std::sync::{Mutex, OnceLock};

    // Single global mutex shared across all tests in this crate
    static CTX_TEST_MUTEX: OnceLock<Mutex<()>> = OnceLock::new();

    pub fn lock_context() -> std::sync::MutexGuard<'static, ()> {
        CTX_TEST_MUTEX
            .get_or_init(|| Mutex::new(()))
            .lock()
            .expect("test context mutex poisoned")
    }
}