### 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.
saved_version = 0;
	current_op.type = TextOperation::TYPE_NONE;
	undo_stack_pos = nullptr;
	undo_stack.clear();
}
bool TextEdit::is_insert_text_operation() const {
	return (current_op.type == TextOperation::TYPE_INSERT || current_action == EditAction::ACTION_TYPING);
}
void TextEdit::tag_saved_version() {
	saved_version = get_version();
}
uint32_t TextEdit::get_version() const {
	return current_op.version;
}
uint32_t TextEdit::get_saved_version() const {
	return saved_version;
}
void TextEdit::set_search_text(const String &p_search_text) {
	search_text = p_search_text;
}
void TextEdit::set_search_flags(uint32_t p_flags) {
	search_flags = p_flags;
}
Point2i TextEdit::search(const String &p_key, uint32_t p_search_flags, int p_from_line, int p_from_column) const {