### 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.
alt_code = alt_code << 4;
					alt_code += (uint32_t)(k->get_keycode() - Key::A) + 10;
				}
				accept_event();
				return;
			}
		}
		if (context_menu_enabled) {
			if (k->is_action("ui_menu", true)) {
				_ensure_menu();
				Point2 pos = Point2(get_caret_pixel_pos().x, (get_size().y + theme_cache.font->get_height(theme_cache.font_size)) / 2);
				menu->set_position(get_screen_position() + pos);
				menu->reset_size();
				menu->popup();
				menu->grab_focus();
			}
		}
		
		if (k->is_action("ui_text_submit", false)) {
			emit_signal(SNAME("text_submitted"), text);
			if (DisplayServer::get_singleton()->has_feature(DisplayServer::FEATURE_VIRTUAL_KEYBOARD) && virtual_keyboard_enabled) {
				DisplayServer::get_singleton()->virtual_keyboard_hide();
			}
		}
		if (is_shortcut_keys_enabled()) {
			if (k->is_action("ui_copy", true)) {
				copy_text();
				accept_event();
				return;
			}