Page Down in editor also does Page Down on page
But, I did just find a new bug to report...
Text in editor and topic at top:
Focus in editor, pressed "Page Down" once:
Overview: Pressing "Page Down" in the editor with enough content to scroll and with the cursor at the top also jumps the page the same as if pressing "Page Down" outside the editor.
I found another bug while I was reporting this one: Page Up in editor has odd effect