BUG: Edit window too small on Hero Unit Content Source Edit

When editing the Content in an Offscreen Hero Unit block, if you click on Source to edit the source code, it only allows 2 lines to be seen at a time. This makes it very difficult to make edits. Does anyone know how to resolve this? Is this a bug to be fixed?

If the editor border has a small triangle bottom right, you can try dragging that to enlarge.

Thanks, John! Just clicking on that and moving it a pixel width allowed the text to fill the edit window. Must be just a small glitch at the open.