Add support for when clause in commands

[avishnyak]

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FEATURE REQUEST:

Support "when" in custom binding commands. This will allow one to create toggle commands that do different things based on the state of the editor.

For example:

"vim.otherModesKeyBindingsNonRecursive": [
        {
            "before": ["-"],
            "commands": [
                {
                    "command": "workbench.files.action.focusFilesExplorer",
                    "when": "editorFocus",
                    "args": []
                },
                {
                    "command": "workbench.action.toggleSidebarVisibility",
                    "when": "explorerViewletFocus",
                    "args": []
                }
            ]
        }
    ]

Pressing - while focused on an editor, shows and sets focus to the file explorer. Pressing - in the file explorer, closes the explorer sidebar and sets you back into the editor.

[xconverge]

I can't figure out a good way to query when, vscode does not expose this information to the extension

[nkabbara]

@avishnyak I was actually also working on mapping '-' to mimic tpope's vim-vinegar. Any luck with this?

[avishnyak]

No. The feature had not been implemented. I have to use '-' to focus the file tree and different shortcuts to get back to the buffer.

[sim590]

Isn't this a duplicate of #1372 ?