New Setting Request: Default (Left-Click) Action

[jwalkerinterpres]

First off, I ❤️ this extension! Thank you so much for creating and maintaining it!

However, I was wondering how easy it would be to add a setting to control what the extension does when you left-click a file. Currently left-click always triggers a comparison, but personally I'd prefer to just open the file (I feel like the extension used to work that way, ages ago, but I might be misremembering).

Obviously it's not that hard to right click and pick "Open to the side" (after I inevitably forget and left-click) ... but if it's not hard, this would be a great setting to have.