Tool does not work w/ iPad.

[mediaczar]

Bit of a first world problem this.

1. Clicking in code window does not reliably bring up keyboard in Chrome, Safari

2. Dragging doesn't work to scroll reliably.

3. Keyboard/delete doesn't work.

[frabcus]

This needs fixing in the ACE code editor. It's a long outstanding bug, although being worked on:
ajaxorg/ace#37

No better in CodeMirror either :(

prose/prose#556