### 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.
selection_delete();
		return;
	}
	int text_len = text.length();
	if (caret_column == text_len) {
		return; 
	}
	if (p_word) {
		int cc = caret_column;
		PackedInt32Array words = TS->shaped_text_get_word_breaks(text_rid);
		for (int i = 1; i < words.size(); i = i + 2) {
			if (words[i] > cc) {
				cc = words[i];
				break;
			}
		}
		delete_text(caret_column, cc);
		set_caret_column(caret_column);
	} else {
		if (caret_mid_grapheme_enabled) {
			set_caret_column(caret_column + 1);
			delete_char();
		} else {
			int cc = caret_column;
			set_caret_column(TS->shaped_text_next_grapheme_pos(text_rid, caret_column));
			delete_text(cc, caret_column);
		}
	}
}
void LineEdit::unhandled_key_input(const Ref<InputEvent> &p_event) {