Re: [w3c/editing] `document.execCommand()` should do nothing when the document is invisible (#193)

> In fact, this is how many major rich text editors that customize text selection/input around the web (such as Google Docs and CodeMirror) work.

For this reason it seems like a bad idea to turn this off. 

At the same time, it should be noted that there are 0 (zero) occurrences of the browser's `execCommand` in the CodeMirror source code [1]. There are a number of occurrences of `cm.exexCommand` which is a CodeMirror internal JavaScript command which only happens to share the same name as the browser native command. I cannot tell for sure about Google Docs as the source code isn't open. So again - `document.execCommand` does not seem to be used a lot if at all by any of the editors we have found over the past few years.

[1] https://github.com/codemirror/CodeMirror/search?p=2&q=execCommand&unscoped_q=execCommand 

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