Some graphic clients such as firefox, thunderbird and sqlitebrowser pop up vertically and horizontally maximized automatically, and floating, without any specific rule in the rc.lua. Or at least I suppose they are so from the icons in the title bar, see screenshot. While others like thunar or blender work just fine.
This is annoying because I didn't find any way to remove this condition. I can make them non floating with mod + ctrl + space, but they are still maximized. Also, clients with such condition resize poorly, they are slightly wider than my main screen and step over to the next screen by a few pixels. I have to maximize them to make them fit the screen.
I did some research and couldn't find any answer to this problem.
Can this come from an obscure rule in the rc.lua? I didn't do much modification from the original example, and I believe this problem wasn't there before a recent awesome update.
I'm using awesome 4.1 on archlinux, with compton as compositing manager.