With the new multi edit updates if you have something selected and then shift+drag over other items, it now only selects matching items, not everything you have dragged over.
While this is a useful feature, I rely on shift+drag to add other items to a selection all the time. It does still allow for shift+click to add to the selection but I rely on the drag to select a lot of things.
This has completely broken my usual workflows!
I feel the multi edit matching select should be a different short cut like shift+command+drag.
It definitely has its place in the product but personally I feel it is no where near as useful/common as just regularly adding to a selection.