### 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.
insert_text_at_caret(String::chr(0x00AD));
			}
		}
	}
}
void TextEdit::start_action(EditAction p_action) {
	if (current_action != p_action) {
		if (current_action != EditAction::ACTION_NONE) {
			in_action = false;
			pending_action_end = false;
			end_complex_operation();
		}
		if (p_action != EditAction::ACTION_NONE) {
			in_action = true;
			begin_complex_operation();
		}
	} else if (current_action != EditAction::ACTION_NONE) {
		pending_action_end = false;
	}
	current_action = p_action;
}
void TextEdit::end_action() {
	if (current_action != EditAction::ACTION_NONE) {
		pending_action_end = true;
	}
}
TextEdit::EditAction TextEdit::get_current_action() const {
	return current_action;
}
void TextEdit::begin_complex_operation() {