After saving a document with the "Replace" button, the view will collapse and close every expanded node in the document. When carefully making deeply nested changes in a document one-by-one and testing as you go, this behavior requires the programmer to expand the document to the same nested level over and over again. If Compass simply didn't refresh the view (or refreshed but remembered which nodes where open at the time "Replace" was pressed), editing and testing documents would be much more efficient.