### 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
if (selecting_enabled == p_enabled) {
		return;
	}
	selecting_enabled = p_enabled;
	if (!selecting_enabled) {
		deselect();
	}
}
bool TextEdit::is_selecting_enabled() const {
	return selecting_enabled;
}
void TextEdit::set_deselect_on_focus_loss_enabled(const bool p_enabled) {
	if (deselect_on_focus_loss_enabled == p_enabled) {
		return;
	}
	deselect_on_focus_loss_enabled = p_enabled;
	if (p_enabled && has_selection() && !has_focus()) {
		deselect();
	}
}
bool TextEdit::is_deselect_on_focus_loss_enabled() const {