The function is an internal Motif function provided for backwards compatibility with historic binaries. Newly built applications are not supposed to call it. This presently works by accident because the Fedora GCC compiler accepts implicit function declarations (while printing a warning). Future compilers will reject that coal.

I'm going to push a change that just removes the call, under the assumption that that changing the focus is optional in this context.

Upstream has deprecated the X11 component, so I assume there is no interest there to fix this properly.