I like the way Foxit Reader can change the color of both pdf text background and font; I have books in pdf format that I need to read on the laptop and I want to control the colors of text area. (I have other options to achieve the same purpose - more here) but I would prefer to use Foxit Reader instead of Adobe Reader (not supported anymore, albeit installable on my system) and Master PDF Editor (more of an editor than a reader).
Foxit Reader doesn't follow system theming on Linux for the moment, but that wouldn't be such a big problem for me if it had a full-screen option. But it lacks that too. There is no such option within the program and its window doesn't enter full-screen mode with F11 as other program's windows do.
I am especially interested in Xfwm4 in Xfce, but I would like to know if other window managers can force full-screen on an application that doesn't cover that aspect itself.
How come the window manager cannot force full-screen on any window? Can that limitation be overcome? Is there a difference between window managers when it comes to that?