Bug: up/down keys in annotation editor

I'm running 6.0.23-beta.9+9a7486e53

I'm noticing wonky behavior from the up/dwon arrow keys when I have selected a highlight and am editing the comment.

- When I first select the highlight, the text pops up, but there is no cursor visible.Arrow keys navigate between annotations ("selecting mode").This is good and expected.
- Clicking the text box shows the cursor.I'm in "editing mode" now.Pressing left/right arrow key moves the cursor.Good, as expected.
- *BUT* pressing up/down moves between highlights.I am now in both editing and selecting mode.This is bad and unexpected.Typing letters edits the note, but arrow keys switch notes, and most problematically, backspace deletes notes!
- Note that this only happens if up/down is the first key pressed after the cursor appears.
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