### 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.
draw_caret = !draw_caret;
	if (is_visible_in_tree() && caret_can_draw) {
		queue_redraw();
	}
}
void LineEdit::_validate_caret_can_draw() {
	if (caret_blink_enabled) {
		draw_caret = true;
		caret_blink_timer = 0.0;
	}
	caret_can_draw = editable && (window_has_focus || (menu && menu->has_focus())) && (has_focus() || caret_force_displayed);
}
void LineEdit::delete_char() {
	if ((text.length() <= 0) || (caret_column == 0)) {
		return;
	}
	text = text.left(caret_column - 1) + text.substr(caret_column);
	_shape();
	set_caret_column(get_caret_column() - 1);
	_text_changed();
}
void LineEdit::delete_text(int p_from_column, int p_to_column) {