I need a CodeMirror editor which starts with a certain width and then grows automatically to the right to match the maximum line length. I.e. roughly what CodeMirror does when height is set to auto, but with width.
Here's a self-contained example. The editor grows automatically along the y-axis fine, but not along the x-axis. By tweaking the CSS, I can either have a fixed width editor with a scrollbar, or one which fills the entire width of the browser, but not one which grows as you type. I assume overflow-x is relevant, but I don't understand how it interacts with other CSS size properties set on parent elements. I also tried setting that property on CodeMirror-scroll, but it didn't help.
I believe this can be done using CSS properties alone. In fact I have this behaviour in my application already, but growing to the left, rather than the right, but I don't understand why it happens, or how to reproduce it in a small example.
This question is essentially the same, but for the vertical scrollbar.
Simply add float:left to the CodeMirror div.
<div id="here" style="float:left"></div>