### Godot version

4.0 beta 15

### System information

Windows 10

### Issue description

It happened with both Google IME and MS-IME, and there was no problem until Beta14.
When typing Japanese characters, it is common to select a character from the suggestion window and then start typing the next character before confirming.
In this case, uncommitted characters are forcibly committed, and input of the next character begins.

**↓Beta15**

https://user-images.githubusercontent.com/186786/214753450-b493cca6-2644-4b3d-8cd2-660565cc3547.mp4

**↓Beta14**

https://user-images.githubusercontent.com/186786/214755127-dde819cc-4d63-403a-99b0-09821671f74e.mp4



### Steps to reproduce

It happened with both Google IME and MS-IME in beta15

### Minimal reproduction project

It is project independent and happens in the editor.
}
			return false;
		}
		if (k->is_alt_pressed()) {
			if (!alt_start) {
				if (k->get_keycode() == Key::KP_ADD) {
					alt_start = true;
					alt_code = 0;
					return true;
				}
			} else {
				if (k->get_keycode() >= Key::KEY_0 && k->get_keycode() <= Key::KEY_9) {
					alt_code = alt_code << 4;
					alt_code += (uint32_t)(k->get_keycode() - Key::KEY_0);
				}
				if (k->get_keycode() >= Key::KP_0 && k->get_keycode() <= Key::KP_9) {
					alt_code = alt_code << 4;
					alt_code += (uint32_t)(k->get_keycode() - Key::KP_0);
				}
				if (k->get_keycode() >= Key::A && k->get_keycode() <= Key::F) {
					alt_code = alt_code << 4;
					alt_code += (uint32_t)(k->get_keycode() - Key::A) + 10;
				}
				return true;
			}
		}
	}
	return false;
}
void TextEdit::gui_input(const Ref<InputEvent> &p_gui_input) {