If you’ve resized your window off-screen and cannot resize it to fit back onto the screen as a result of the lower-right-corner resizing that is now off-screen, then you can get around it by the following:
1) Run: Applications->AppleScript->ScriptEditor
2) In the editor, type the following:
tell application “Finder”
set bounds of window 1 to {202, 103, 817, 508}
end [...]

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