Characters sent to input text are being repeated

[juliusl]

Describe the bug
A clear and concise description of what the bug is.

On the main branch, when typing into an input text, the characters are being repeated.

Env

• winit 0.29.0, wayland

Other information
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It looks like the issues is because in winit 0.29.0 they removed the ReceivedCharacter event, so now imgui-winit-support calls add_input_character inside of KeyboardInput.

I think the problem is that the KeyboardInput event is emitted twice (press/release) which means add_input_character is going to be called twice.

[juliusl]

Tried a fix and seems to work,

 WindowEvent::KeyboardInput { ref event, .. } => {
                if let Some(txt) = &event.text {
                    if event.state.is_pressed() {
                        for ch in txt.chars() {
                            if ch != '\u{7f}' {
                                io.add_input_character(ch)
                            }
                        }
                    }
                }

[Helyos96]

Happening on X11 here, but Windows is fine.

[filnet]

nit: in the proposed fix, the is pressed check should be done before extracting the event text.