On gvim:
set columns = 50
resizes a window

This also works in terminal nvim (using gnome terminal).

However, this doesn't work for me in neovim-gtk.
If the new number of columns is smaller than the old number, then the window stays the same size, but the "editor space" gets reduced.
If the new number of columns is larger than the old number, then nothing appears to happen.
Is that expected? If so, is there a different command I should be using?

In case it is not expected, here is my system info:

• OS: Linux Mint Cinnamon 19
• Neovim version: 0.2.2
• Neovim-Gtk build version: commit f4c2b2c from October 25th