Currently, Dolphin displays a red banner informing that the file is too large to be trashed and doesn't tell the user what do to. A inexperienced user might not know that is possible to delete the file permanently with Shift+Delete. Dolphin could, instead, show a dialog asking the user to delete the file permanently or not.
Created attachment 140304 [details] "File is too large to be trashed"
*** This bug has been marked as a duplicate of bug 424717 ***