Vim: Support `<C-w>s` for window splitting

[edwintorok]

BUG REPORT:

What happened:
<C-w>v doesn't work correctly if editor layout is toggled

What did you expect to happen:

• <C-w>s should split horizontally
• <C-w>v splits only vertically

Although VSCode itself does not support grid layout yet (https://github.com/Microsoft/vscode/issues/14909) it does support toggling layouts between horizontal and vertical.
I think that the Vim extension should check which layout mode VSCode is in currently and enable the appropriate <C-w>s or <C-w>v keybinding.

How to reproduce it (as minimally and precisely as possible):

• View -> Toggle Editor Group Layout
• <C-w>v wrongly splits horizontally instead of vertically
• <C-w>s does nothing

Environment:

Linux

• Extension (VsCodeVim) version: 0.10.13
• VSCode version: 1.20.0 c63189deaa8e620f650cc28792b8f5f3363f2c5b x64
• OS version: Ubuntu 17.10

[Dvbnhbq]

I'd like to have all the C-w commands such as C-w, HJKL for navigating, C-w, = to make windows equal etc., to avoid using a mouse or trackpad.

[bpasero]

Duplicate of https://github.com/VSCodeVim/Vim/issues/2696 ?

[jpoon]

Indeed. Thanks @bpasero. Duplicate of #2696