OK / Cancel button actions when closing a tab are wrongly interchanged when clicked via keyboard.

When I use the keyboard shortcut to close a tab in konsole (Ctrl-Shift-W by default if I remember correctly) and there is still a process running in the shell, Konsole will display a warning message dialog window with an OK and a Cancel button. If the user clicks those buttons via the mouse, everything is allright, no wrong behaviour. But if the user clicks those via keyboard (which konsole users should do quite often), the both actions are swapped/interchanged. That is, when I select the OK button (via hitting TAB) and then hit it (via either Space or Return), I get precisely the action I did not want.

I reproduced this behaviour on several different distributions: openSUSE 42.1 Leap, Fedora 23, Kubuntu.

Reproducible: Always

Steps to Reproduce:
1. Open a Konsole window
2. Open a new tab
3. Start e.g. "mc"
4. Hit Ctrl-Shift-W
5. Select that you did not want to close the tab
6. See your tab is gone anyways.

Actual Results:  
see above.

Expected Results:  
see above.