In the process I found a bug: enter/backspace can modify the left-most column. Anyways, it's now fixed. Let's see how this looks now..
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elseif chord == 'C-f' or chord == 'backspace' or chord == 'return' then
-- find in just the left-most pane for now
edit.keychord_press(Editors[1], chord, key)
elseif chord == 'pageup' or chord == 'pagedown' or Editors[1].search_term then
edit.keychord_press(Editors[1], chord, key)
else
edit.keychord_press(Editors[1], chord, key, --[[readonly]] true)