### Godot version

v4.0.beta.custom_build [13f0158]

### System information

Windows 10

### Issue description

When doing operations (`begin_complex_operation` and `end_complex_operation`) with multiple selections in TextEdit, some of these selections don't revert upon undo. This behavior is affects some of script editor's operations, like duplicate selection and delete lines.

### Steps to reproduce

Open script editor, make multiple selections. Keep in mind what you have selected. Do duplicate selection (ctrl+shift+D). Undo (ctrl+Z). Compare the result to what you remember.

### Minimal reproduction project

N/A
return syntax_highlighter.is_null() && !setting_text ? Dictionary() : syntax_highlighter->get_line_syntax_highlighting(p_line);
}
void TextEdit::_text_changed_emit() {
	emit_signal(SNAME("text_changed"));
	text_changed_dirty = false;
}
void TextEdit::_insert_text(int p_line, int p_char, const String &p_text, int *r_end_line, int *r_end_char) {
	if (!setting_text && idle_detect->is_inside_tree()) {
		idle_detect->start();
	}
	if (undo_enabled) {
		_clear_redo();
	}
	int retline, retchar;
	_base_insert_text(p_line, p_char, p_text, retline, retchar);
	if (r_end_line) {
		*r_end_line = retline;
	}
	if (r_end_char) {
		*r_end_char = retchar;
	}
	if (!undo_enabled) {
		return;
	}
	
	TextOperation op;
	op.type = TextOperation::TYPE_INSERT;
	op.from_line = p_line;
	op.from_column = p_char;