OpenGL/GLUT not re-displaying uncovered windows

I’m a newbie writing an app for Mac and Windows. The app requires multiple windows at once. It all seems to work fine except that in the Windows version, when I slide one window over the immediately previous in-focus one, that window refreshes properly. When I slide the in-focus window over a much earlier window, the much earlier one does not refresh.

So, if I create windows A, B, and C in that order, B will refresh if I drag C over it, but A will not refresh if I drag C over it.

How can I fix this?

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