### 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 (selection.enabled && !p_select) {
		set_caret_column(selection.begin);
		deselect();
		return;
	}
	shift_selection_check_pre(p_select);
	if (p_move_by_word) {
		int cc = caret_column;
		PackedInt32Array words = TS->shaped_text_get_word_breaks(text_rid);
		for (int i = words.size() - 2; i >= 0; i = i - 2) {
			if (words[i] < cc) {
				cc = words[i];
				break;
			}
		}
		set_caret_column(cc);
	} else {
		if (caret_mid_grapheme_enabled) {
			set_caret_column(get_caret_column() - 1);
		} else {
			set_caret_column(TS->shaped_text_prev_grapheme_pos(text_rid, get_caret_column()));
		}
	}
	shift_selection_check_post(p_select);
}
void LineEdit::_move_caret_right(bool p_select, bool p_move_by_word) {