… view draws, to a separate proper text field subview of the scroll view. This prevents the prompt text from scrolling along with the content, and alleviates problems with stale drawing sticking around sometimes when the scrollview has cached its image.
There's something wrong with my pull request, in that adding the prompt as a subview of the scroll view messed up the key view loop. I'm looking into that.
… view draws, to a separate proper text field subview of the scroll view. This prevents the prompt text from scrolling along with the content, and alleviates problems with stale drawing sticking around sometimes when the scrollview has cached its image.