### 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.
ADD_PROPERTY(PropertyInfo(Variant::ARRAY, "structured_text_bidi_override_options"), "set_structured_text_bidi_override_options", "get_structured_text_bidi_override_options");
	
	
	ADD_SIGNAL(MethodInfo("text_set"));
	ADD_SIGNAL(MethodInfo("text_changed"));
	ADD_SIGNAL(MethodInfo("lines_edited_from", PropertyInfo(Variant::INT, "from_line"), PropertyInfo(Variant::INT, "to_line")));
	
	ADD_SIGNAL(MethodInfo("caret_changed"));
	
	ADD_SIGNAL(MethodInfo("gutter_clicked", PropertyInfo(Variant::INT, "line"), PropertyInfo(Variant::INT, "gutter")));
	ADD_SIGNAL(MethodInfo("gutter_added"));
	ADD_SIGNAL(MethodInfo("gutter_removed"));
	
	GLOBAL_DEF(PropertyInfo(Variant::FLOAT, "gui/timers/text_edit_idle_detect_sec", PROPERTY_HINT_RANGE, "0,10,0.01,or_greater"), 3);
	GLOBAL_DEF(PropertyInfo(Variant::INT, "gui/common/text_edit_undo_stack_max_size", PROPERTY_HINT_RANGE, "0,10000,1,or_greater"), 1024);
}
void TextEdit::_set_hiding_enabled(bool p_enabled) {
	if (hiding_enabled == p_enabled) {
		return;
	}
	if (!p_enabled) {
		_unhide_all_lines();
	}
	hiding_enabled = p_enabled;
	queue_redraw();
}
bool TextEdit::_is_hiding_enabled() const {
	return hiding_enabled;
}
bool TextEdit::_is_line_hidden(int p_line) const {