### 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.
} break;
		case MENU_DIR_AUTO: {
			set_text_direction(TEXT_DIRECTION_AUTO);
		} break;
		case MENU_DIR_LTR: {
			set_text_direction(TEXT_DIRECTION_LTR);
		} break;
		case MENU_DIR_RTL: {
			set_text_direction(TEXT_DIRECTION_RTL);
		} break;
		case MENU_DISPLAY_UCC: {
			set_draw_control_chars(!get_draw_control_chars());
		} break;
		case MENU_INSERT_LRM: {
			if (editable) {
				insert_text_at_caret(String::chr(0x200E));
			}
		} break;
		case MENU_INSERT_RLM: {
			if (editable) {
				insert_text_at_caret(String::chr(0x200F));
			}
		} break;
		case MENU_INSERT_LRE: {
			if (editable) {
				insert_text_at_caret(String::chr(0x202A));
			}
		} break;
		case MENU_INSERT_RLE: {
			if (editable) {