I can't use multi-cursor shortcuts, if I don't close all files before I reload window

Is this a BUG REPORT or FEATURE REQUEST? (choose one): BUG REPORT

What happened:

I have a clean installed vscode, and only installed vscodevim

If I DON'T CLOSE all files, when I reopen vscode (or reload window), it'll restore the previous session

then I can't use shortcuts to toggle multi-cursor ( shortcut: "gb" in normal mode)

If I open a new empty file, everything's ok again (I can press shortcut to use multi-cursor)

but if I close this new file when it focus, the problem happens again

I hope I can explain clearly, so I made two gif

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

1. keep only one file opened (e.g. example.js)

2. close vscode

3. open vscode again

4. press shortcut "gb" to toggle multi-cursor

Environment:

• Extension (VsCodeVim) version: 0.10.13
• VSCode version: 1.19.2 / 1.19.3
• OS version: windows / linux

Reproduce the issue using the listed VSCodeVim and VS Code versions with one restored file, then compare the restored-session state with a newly opened empty file. Start by tracing restored editor handling and the normal-mode "gb" multi-cursor mapping. Done means the shortcut works after reopening or reloading without requiring an additional file to be opened.