I can't believe I didn't observe any issues with this. Goes to show how rare it is to skip updating pane.top.
RVCCMLKSWA4SDFF64E2X74IK3GIOEK2XWFNSPWR7SL75GEM3E5TQC
DYPXQWZ6RE4WQWYRMWLI4JVNTEH637CDVLG5RQ3D5KNPZ73C7UHAC
OTIBCAUJ3KDQJLVDN3A536DLZGNRYMGJLORZVR3WLCGXGO6UGO6AC
if pane_index ~= Cursor_pane.col then return true end
if pane_index ~= Cursor_pane.row then return true end