I am experiencing recently the following problem. I open the page to edit and when I click on save, the dialog window comes. I would expect (and thats how it worked previously), that I can than continue writing edit summary. But know, I have to move cursor to that window and click to activate the option of writing. I think this is not necessary complication, which push editors to spent more time with something, which doesn't contribute to the creation of Wikipedia.
Tested in FF 34.0.5 and Google Chrome at cs.wp and cs.wn.