Open Multiroot workspace from command line

[mjbvz]

If you pass multiple folders to code, we currently open multiple instances of VSCode:

code ~/server ~/client-ios

I believe we should add an option that opens all the passed in folders as roots in a workspace. This could either be the default behavior or controlled with a flag:

code --multiroot ~/server ~/client-ios

[Tyriar]

I'd go with changing the default unless there are objections. Any opinions @Microoft/vscode?

[bpasero]

Makes sense to me. However we should probably also have a new command line argument to add a folder to the last used window.

[Tyriar]

@bpasero that can piggyback on -r? code some-file some-folder will open some-file in an editor and add some-folder to the workspace?

[bpasero]

Yeah maybe that is a good idea.

[Tyriar]

Actually maybe that isn't ideal, one of my favorite cli commands is code -r . which would then become a little ambiguous.

[bpasero]

Opening a VS Code workspace now works by just typing code myWorkspace.code-workspace from the command line. I extracted #30598 to cover the case of adding additional folders from the command line and #30599 to cover the case of opening multiple folders in one instance.

[weinand]

I verified that code myWorkspace.code-workspaceworks.