When I try to resize the input box, I get overlap by the Similar Questions box. Obviously this isn't very useful.
Maybe a way to disable it automagically when I resize or finding a new geometry for it?
+1. I don't think there is a reason why the edit box can have an opaque background and a higher (if not the highest) z-index.
Also, people who don't format their code so that the horizontal scrollbar isn't needed should be punched in the face.
To my knowledge, this is exclusively a browser 'feature': I'll assume you're using Chrome?
Regardless, this is not a bug with any particular bearing on SO, it is a bigger issue than that. I'd perhaps recommend researching into this topic in an area where there is an active community, or support for your specific browser.
This is now status-completed, sort of, but not in the way you wanted. There's a good reason that the standard defaults resizing to be turned off; unfortunately, some browsers ignore this. Vertical resizing of the editor is okay, but that's already possible via the TextAreaResizer plugin which works in all browsers. As far as horizontal resizing goes, I agree with Andy E.'s comments on your question.
For freely resizable text areas to be considered supported, everything else has to take this possibility into consideration. But when we say we want the editor to have a width of 660 pixels, we mean it, since the rest of the page is styled under that assumption.
The fact that both Firefox and Chrome default this to "on" for text areas is wrong and thus broken. So textarea { resize: none }
is now part of the CSS reset.
resize:none;
styling to the<textarea>
. That would certainly solve your problem :-)