Albrecht - That is absolutely amazing! Yes, that change addresses the issue - tested on both Windows7 and Windows 10!

I can't see any negative side effects. Before-and-after behavior appears to be the same except for the focus flash.

For completeness, I'm attaching my test source and the two x64 windows exes.
fltk261.cpp.txt
fltk261_fix.zip
fltk261_nofix.zip

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