### 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.
font = get_theme_font(SNAME("font"));
	font_size = get_theme_font_size(SNAME("font_size"));
	font_color = get_theme_color(SNAME("font_color"));
	font_readonly_color = get_theme_color(SNAME("font_readonly_color"));
	font_placeholder_color = get_theme_color(SNAME("font_placeholder_color"));
	outline_size = get_theme_constant(SNAME("outline_size"));
	outline_color = get_theme_color(SNAME("font_outline_color"));
	line_spacing = get_theme_constant(SNAME("line_spacing"));
	background_color = get_theme_color(SNAME("background_color"));
	current_line_color = get_theme_color(SNAME("current_line_color"));
	word_highlighted_color = get_theme_color(SNAME("word_highlighted_color"));
	
	TextServer::Direction dir;
	if (text_direction == Control::TEXT_DIRECTION_INHERITED) {
		dir = is_layout_rtl() ? TextServer::DIRECTION_RTL : TextServer::DIRECTION_LTR;
	} else {
		dir = (TextServer::Direction)text_direction;
	}
	text.set_direction_and_language(dir, (!language.is_empty()) ? language : TranslationServer::get_singleton()->get_tool_locale());
	text.set_draw_control_chars(draw_control_chars);
	text.set_font(font);
	text.set_font_size(font_size);
	text.invalidate_font();
	_update_placeholder();
	
	if (syntax_highlighter.is_valid()) {
		syntax_highlighter->set_text_edit(this);
	}
}
Size2 TextEdit::get_minimum_size() const {