One thing that is missing is the copy image menu. Often when browsing my photos I want to send them to my friends over telegram or whatsapp, and normally I can do that just copying the image to clipboard and pasting it there. However, gwenview has no copy option, which makes the process really annoying, because I need to open the image in kolourpaint, then copy it, then paste it in the chat.
*** Bug 383091 has been marked as a duplicate of this bug. ***
FWIW, the Copy item in the Edit menu (and its keyboard shortcut) do work. But I agree that we should add a copy item to the context menu.
*** This bug has been marked as a duplicate of bug 290294 ***