Requesting focus for a TextEdit on key press causes UI to freeze

[vanleefxp]

I have a TextEdit and I hope to grab its focus when the key N is pressed. So I wrote the following code. The code is placed in App's update function.

let text_edit = TextEdit::singleline(duration_src) // `duration_src` is a mutable borrow of a `String` stored in the `App` struct
.desired_width(100.).hint_text("Music Duration");
let out = text_edit.show(ui);
if out.response.has_focus() {
    self.context.edit.key_edit_enabled = false;
} else {
    ui.input(|i| {
        if i.key_pressed(Key::N) {
            out.response.request_focus();
        }
    });
}
if out.response.lost_focus() {
    if let Ok(duration) = duration_src.parse::<q16>() {
        self.context.edit.music_duration = duration;
    }
    *duration_src = self.context.edit.music_duration.to_string();
    self.context.edit.key_edit_enabled = true;
}

However when running my program and pressed N, the UI freezes. Any other operation has no reaction. And after a few seconds my program crashes with the following message in console:

thread 'main' (15400) panicked at D:\Program Files\Rust\.cargo\registry\src\rsproxy.cn-e3de039b2554c837\epaint-0.33.3\src\mutex.rs:101:17:
DEBUG PANIC: Failed to acquire RwLock write after 10s. Deadlock?
note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace
error: process didn't exit successfully: `target\debug\eframe_template.exe` (exit code: 101)

So what am I doing wrong in my program? I think this should be a very basic functionality and many programs might require this feature.