### 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.
case NOTIFICATION_FOCUS_EXIT: {
			if (caret_blink_enabled) {
				caret_blink_timer->stop();
			}
			if (get_viewport()->get_window_id() != DisplayServer::INVALID_WINDOW_ID && DisplayServer::get_singleton()->has_feature(DisplayServer::FEATURE_IME)) {
				DisplayServer::get_singleton()->window_set_ime_position(Point2(), get_viewport()->get_window_id());
				DisplayServer::get_singleton()->window_set_ime_active(false, get_viewport()->get_window_id());
			}
			if (!ime_text.is_empty()) {
				ime_text = "";
				ime_selection = Point2();
				for (int i = 0; i < carets.size(); i++) {
					text.invalidate_cache(get_caret_line(i), get_caret_column(i), true, ime_text);
				}
			}
			if (DisplayServer::get_singleton()->has_feature(DisplayServer::FEATURE_VIRTUAL_KEYBOARD) && virtual_keyboard_enabled) {
				DisplayServer::get_singleton()->virtual_keyboard_hide();
			}
			if (deselect_on_focus_loss_enabled && !selection_drag_attempt) {
				deselect();
			}
		} break;
		case MainLoop::NOTIFICATION_OS_IME_UPDATE: {
			if (has_focus()) {
				ime_text = DisplayServer::get_singleton()->ime_get_text();
				ime_selection = DisplayServer::get_singleton()->ime_get_selection();
				if (!ime_text.is_empty()) {
					delete_selection();
				}
				for (int i = 0; i < carets.size(); i++) {