When a keyboard navigation is used (DELETE, CTRL-D, etc.), there is a delay in timing to show the action popup (the "undo" message for any move or delete). in the time it takes for this popup to show, another action for move can be started (select item with SPACE, CTRL-D to show the move popup, and focus is in the "Search" box), and the action popup steals focus from the "Search" box.
The user then has to then use the mouse to reselect the Search box (CTRL-D doesn't trigger to reselect the "Search" box because the listing is not the control with focus).
Right now, the user has to wait for the action popup to time out and disappear before attempting to do another action (such as CTRL-D).
Classic interface did not shift focus to the action popup, meaning this wasn't an issue before.