A few hours ago, I discovered another way to make X window managers and applications so that the beginning of a drag does not raise the drag-source window. This method is even simpler than the method I wrote about in October.
That old method worked well and I had demos on my website for a short time. While writing to gnome-accessibility-list to request an assessment of the method's accessibility impact, I discovered the simpler method. (And cancelled the suddenly obsolete message.) The old method also made it easy to eliminate other problems. The new one eliminates even more problems.
Neither method introduces a new protocol. They both rely on what's in the ICCCM and judicious window management policies.
The ICCCM revision history seems to indicate that both methods have been possible since 1989, when ICCCM version 1.0 was released.
Is it better to be the first person to realize this than not? If I'm the first, then everyone else has missed the solution. If I'm not the first, then somebody else has been either silent or unduly ignored. It would have been better to not have considered the question.