When opening an image with gwenview the following dialogue appears: "There are two actions (Cut, Delete) that want to use the same shortcut (Shift+Del). This is most probably a bug. Please report it in bugs.kde.org" Click 'ok' and the image appears, checkboxed the option 'do not show this message again' prior to. gwenview version 16.04.3
*** This bug has been marked as a duplicate of bug 377880 ***
latest gwenview has missing functions when installed with Mint 18.3 sylvia all in all its crap