Is there a faster way or keyboard shortcut to close files without saving in Preview? When closing an unsaved file in Preview, you're presented with the "Do you want to keep this new document" modal:



There doesn't seem to be a quick way to access the Delete button besides tabbing or using the mouse. I work with a lot of quick throwaway screenshots throughout the day and this step slows me down. 

Is there a keyboard shortcut for this button, or another way to close files that will not show this dialog?
In a "Save As" window, press ⌘Delete to close the window and delete the unsaved file.

This essentially selects the "Delete" option from that "Save As" window.

Pressing Escape selects the "Cancel" option. Enter selects "Save".