title: Awesome WM: some clients pop up floating and vertically and horizontally maximized
body: <p>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 <a href="https://i.stack.imgur.com/OyuI8.png" rel="nofollow noreferrer">screenshot</a>. While others like thunar or blender work just fine.</p>
  
  <p>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.</p>
  
  <p>I did some research and couldn't find any answer to this problem.</p>
  
  <p>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.</p>
  
  <p>I'm using awesome 4.1 on archlinux, with compton as compositing manager.</p>