External keyboard: Prevent shift+tab in Title field

[frosty]

When using an external keyboard, you can press the tab key to move to the main content area when the title field has focus. You can also press shift+tab to move back to the title when the main content area has focus. This is good!

However, you can also press shift+tab when the title field has focus, which puts the cursor into some extra textview which types over the top of the existing content area. The styling seems to match the HTML view, so I wonder if that's what it is. For what it's worth, I can't trigger this if I've already toggled to the HTML view and back again.

Here are two examples of how it looks: