Code like this should be considered valid:

$obj->setFoo('foo')
    ->setBar('bar')
    ->setBaz('bar')
;

Where the semicolon is allowed on the next line with the same indentation that $obj has. Currently, our coding standard forces this semicolon onto the last method call:

 $obj->setFoo('foo')
     ->setBar('bar')
+    ->setBaz('bar');
-    ->setBaz('bar')
-;

This would require something like PHP-CS-Fixer/PHP-CS-Fixer#3679 to be merged, or us to write a custom sniff.

See also PHP-CS-Fixer/PHP-CS-Fixer#2723