Usage of switch_to_blog() and restore_current_blog()

Hi,
I found an illegal usage of switch_to_blog() and restore_current_blog().

wp-category-tag-cloud.php: line 155

foreach ( $blogs as $blog ) {
	switch_to_blog( $blog );
	$this->single_activate( $network_wide );
}

restore_current_blog();

This should be:

foreach ( $blogs as $blog ) {
	switch_to_blog( $blog );
	$this->single_activate( $network_wide );
	restore_current_blog();
}

These APIs have a stack (actually just an array) inside.
switch_to_blog() pushes current blog id to the stack and restore_current_blog() pops the stack and back to the previous blog in the switching history.
We need to call restore_current_blog() same number of times of calling switch_to_blog().

I’m not sure this effect, but in generally, this causes strange behaviors of whole WordPress, because of switch_to_blog() replaces global variables.