I know that question have been answer, but answer is no more current
with wp 3.5.2 (or 3.6) and many plugin, qtranslate first... i dont have the "size of the post box" in Settings > Writing. Yes i can manually extent the box with the lower right triagle, but when saved, it's back to super small 2-3 line in height
So the question, how do i change it PERMANANTLY to 30 line in height ?