### 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.
_emit_text_change();
	_clear_redo();
}
void LineEdit::_emit_text_change() {
	emit_signal(SNAME("text_changed"), text);
	text_changed_dirty = false;
}
void LineEdit::_shape() {
	const Ref<Font> &font = theme_cache.font;
	int font_size = theme_cache.font_size;
	if (font.is_null()) {
		return;
	}
	Size2 old_size = TS->shaped_text_get_size(text_rid);
	TS->shaped_text_clear(text_rid);
	String t;
	if (text.length() == 0 && ime_text.length() == 0) {
		t = placeholder_translated;
	} else if (pass) {
		t = secret_character.repeat(text.length() + ime_text.length());
	} else {
		if (ime_text.length() > 0) {
			t = text.substr(0, caret_column) + ime_text + text.substr(caret_column, text.length());
		} else {
			t = text;
		}
	}
	if (text_direction == Control::TEXT_DIRECTION_INHERITED) {
		TS->shaped_text_set_direction(text_rid, is_layout_rtl() ? TextServer::DIRECTION_RTL : TextServer::DIRECTION_LTR);