Do nothing in ShowWindow(SW_SHOW) if a window is already visible.
[wine] / dlls / comctl32 / string.c
2004-05-17  Patrik StridvallStrSpnW doesn't exist in comctl32.dll but StrCSpnW...
2004-02-20  Alexandre JulliardRemoved a couple of unneeded helper functions.
2004-02-20  Robert Shearman- Implement string functions in comctl32.
2004-02-17  Robert ShearmanMove string functions to separate file.