Allow resizing of text areas

[loic-sharma]

Hello,

I've used this extension for a few minutes now, and so far I'm loving it! Great work!

When I was first playing with the extension, I quickly realized I could no longer resize text areas. I didn't realize the F11 shortcut existed until I scanned through this project's README. Some ideas:

1. Would it be difficult to add support for resizing text areas? Otherwise,
2. Consider advertising the F11 shortcut at the bottom of the editor:

[hediet]

(2) is a great idea, I will definitely do that! Thanks for sharing it. (1) is more work to implement though. I'm welcoming PRs 😉

[texastoland]

On Mac F11 isn't easy as does something else by default 🙈