The layer appears blue.
 and
  and   (Windows) or
  (Windows) or   and
  and   (Mac) keys to add other
               layers or folders to the selection.
  (Mac) keys to add other
               layers or folders to the selection. 
               The new selected layers/folders appear in white.
The selected layers are pasted into the active canvas, above its original active layer, and remain selected. The names and relative positioning of the pasted layers is preserved.