Simple undo command behaviour from vi/vim not implemented

[mchong-teal]

Describe the bug
The command ":u" is not implemented. This is how I normally perform undo actions in vi/vim and makes this add-on unusable for me.

To Reproduce

• Open a file with vscode/vim
• perform an action
• press escape to go to normal (command mode)
• enter the command ":u"
• press enter
• see: 'Not an editor command u'
• repeat
• uninstall

Expected behavior

• The previous action is undone

Environment (please complete the following information):

• Issue Type: Bug
• Extension Name: vim
• Extension Version: 1.3.0
• OS Version: Linux x64 4.15.0-46-generic
• VSCode version: 1.32.3

[coreysharris]

Any reason you use ":u" instead of the normal-mode command "u"?

https://vimhelp.org/undo.txt.html#undo-commands

[mchong-teal]

Muscle memory?

[J-Fields]

Closing as a duplicate of #3197