Overcome OS Imposed Windows Form Minimum Size Limit
After much experimentation and trial-and-error, I have discovered a solution. I was overriding OnResize and conforming the size of the form to the ListBox in it (see my comment on John Saunders answer). As I mentioned in my question, I noticed that the size of the form regresses after WM_WINDOWPOSCHANGED is sent. Further investigation revealed … Read more