We don't ever call one app's settings while Current_app is the other.
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if Current_app == 'source' then
--? print('reading source window position')
Settings.source.x, Settings.source.y, Settings.source.displayindex = App.screen.position()
end
--? print('saving source settings', Settings.source.x, Settings.source.y, Settings.source.displayindex)
Settings.source.x, Settings.source.y, Settings.source.displayindex = App.screen.position()