dragging stacks from the library in window mode requires two clicks

[yourhead]

the drag currently works with the selected library item. since the pallet is floating it never steals the first responder from the mainwindow (avoids first responder). it only gets first responder when the user directly interacts with it.

the solution, i guess, is to make drag work even when the item is not selected in the special case of the window-mode without first-responder.

[yourhead]

seems a bit dicey, maybe worth looking around at other apps to see if other people have better solutions.