Consider this code:

<span style="display: run-in">Foo</span>
<div>
  <span style="display: run-in">Bar</span>
</div>

Foo is inserted inside the div block box. But then, do Foo and Bar become part of the same run-in sequence? Or do they continue being different sequences, and thus are wrapped in different anonymous block boxes? That is, does being reparented recalculate run-in sequences?