### 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.
if (!EditorSettings::get_singleton()->is_connected("settings_changed", callable_mp(this, &LineEdit::_editor_settings_changed))) {
					EditorSettings::get_singleton()->connect("settings_changed", callable_mp(this, &LineEdit::_editor_settings_changed));
				}
			}
		} break;
#endif
		case NOTIFICATION_RESIZED: {
			_fit_to_width();
			scroll_offset = 0.0;
			set_caret_column(get_caret_column());
		} break;
		case NOTIFICATION_LAYOUT_DIRECTION_CHANGED:
		case NOTIFICATION_THEME_CHANGED: {
			_shape();
			queue_redraw();
		} break;
		case NOTIFICATION_TRANSLATION_CHANGED: {
			placeholder_translated = atr(placeholder);
			_shape();
			queue_redraw();
		} break;
		case NOTIFICATION_WM_WINDOW_FOCUS_IN: {
			window_has_focus = true;
			_validate_caret_can_draw();
			queue_redraw();
		} break;
		case NOTIFICATION_WM_WINDOW_FOCUS_OUT: {
			window_has_focus = false;
			_validate_caret_can_draw();
			queue_redraw();