fix #320 #710
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fix #320 #710
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fixes #320 — if you click into an editor, or type while it's focused, the tab key will then indent stuff. But if you tab into it and press again, the tab key will not indent stuff — instead, focus travels to the next focusable element.
This means we meet the no-keyboard-trap requirement of WCAG 2.1 https://www.w3.org/TR/WCAG21/#no-keyboard-trap