Rather than assuming the input panel to always be less than or equal to
the maximized area, ensure it is. This ensures that the input panel gets
placed correctly when there maximized area is smaller, like when there's
a panel on the side.

Additionally, don't skip the entire positioning code when "m_output" is
empty, to avoid the placement not happening when Kickoff is open.


(cherry picked from commit 03a3ae66)