There are cases, when keyboard doesn't intersect view controller's view: e.g. view controller is shown modally with modalPresentationStyle == .formSheet on iPad, however keyboardLayoutGuide is shrinked by the height of the keyboard.

In other-than english layout (for example in Russian) dot may be on unusual place. For example for Russian layout / key (which in English layout start search) is .. So when you want to make search and have by accident Russian layout instead of English you face dot command instead of search. Last can be pretty destructible: delete couple of lines or insert some non sense and etc.

Idea is to

examples/output/xkb/run-session.sh
Warning:          Unsupported high keycode 372 for name <I372> ignored
                  X11 cannot support keycodes above 255.
                  This warning only shows for the first high keycode.
Internal error:   Could not resolve keysym XF86ScrollRight
Error:            Button must specify default or be in the range 1..5
                  Illegal b