This was eventually replaced by nxagentAddConfiguredWindow(pWin,
CW_Map) some lines below which is just leading to the same code being
executed some time later.

(nxagentAddConfiguredWindow() will add a window to a
list. nxagentFlushConfiguredWindow() is called at certain points to
update all windows in that list in one go. "update" here means calling
XConfigureWindow() or XMapWindow() on the real display.)