Sortable: Skip items that are not at the same line as the cursor when floating. Fixes #8792 - Issue with floated items in connected lists. Fixes #9042 -  Unstable dragging / sorting with jQuery UI 1.9.1 and above
Sortable: Simplifies code by defining a variable
Sortable: Skip updating current container if it's the same as the innermost container. Fixes comment 5 of #9041: the over event fires on every pixel movement