### 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.
rect.size.x = ofs_max - rect.position.x;
								}
								rect.size.y = caret_width * 3;
								RenderingServer::get_singleton()->canvas_item_add_rect(ci, rect, caret_color);
							}
						}
					}
				}
			}
			if (has_focus()) {
				if (get_viewport()->get_window_id() != DisplayServer::INVALID_WINDOW_ID && DisplayServer::get_singleton()->has_feature(DisplayServer::FEATURE_IME)) {
					DisplayServer::get_singleton()->window_set_ime_active(true, get_viewport()->get_window_id());
					Point2 pos = Point2(get_caret_pixel_pos().x, (get_size().y + theme_cache.font->get_height(theme_cache.font_size)) / 2);
					DisplayServer::get_singleton()->window_set_ime_position(get_global_position() + pos, get_viewport()->get_window_id());
				}
			}
		} break;
		case NOTIFICATION_FOCUS_ENTER: {
			_validate_caret_can_draw();
			if (select_all_on_focus) {
				if (Input::get_singleton()->is_mouse_button_pressed(MouseButton::LEFT)) {
					
					pending_select_all_on_focus = true;
				} else {
					select_all();
				}
			}
			if (get_viewport()->get_window_id() != DisplayServer::INVALID_WINDOW_ID && DisplayServer::get_singleton()->has_feature(DisplayServer::FEATURE_IME)) {
				DisplayServer::get_singleton()->window_set_ime_active(true, get_viewport()->get_window_id());
				Point2 pos = Point2(get_caret_pixel_pos().x, (get_size().y + theme_cache.font->get_height(theme_cache.font_size)) / 2);