On my 1366 pixel wide laptop screen -- starting with version 3.14.x -- it's no longer possible to split the screen into two nautilus windows using mutters snap functionality. Neither the screen borders react on dragging the window nor the keyboard accelerators.

I can't manually resize the window width to less than half the screen's width, too.

rtcm on the irc channel guessed that this is "probably caused by all the widgets in the new headerbar. nautilus (or possibly gtk) would need to code to somehow hide some widgets. mutter won't try to resize windows less than their advertised minimum size. nautilus is probably advertising a minimum width which is bigger than 1366/2."

In my eyes this is a major issue with nautilus' design.