Issue 641: Window size prestting is not working
Issue 641: Window size prestting is not working

The constructor for NeovimQt::App(...) can truncate recognized arguments. This
causes argument forwarding issues when nvim-qt spawns the `--nofork` instance
in the background.

Generate the `--nofork` instance arguments before calling the NoevimQt::App
CTOR.

equalsraf/neovim-qt,equalsraf/neovim-qt,equalsraf/neovim-qt,equalsraf/neovim-qt