Metacity overview: drag and drop

A new, long explanation in the Metacity blog about why it’s actually rather hard not to raise the lower window when you drag from it to the upper, in case you read planet but not the Metacity blog. GDK hackers are particularly invited to read it. I had to do quite a lot of research and sifting of the original sources to write this and it felt like I was back in grad school for a bit, but if there are any mistakes I really do welcome corrections. And all comments are welcome, of course.