Turns out ctrl+ makes it into lua.textinput. Thanks John Blommers for the report. This should fix https://github.com/akkartik/lines.love/issues/6.
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assert(not App.ctrl_down()) if App.alt_down() or App.cmd_down() then return end
assert(not App.ctrl_down())
if App.alt_down() or App.cmd_down() then return end
if App.ctrl_down() or App.alt_down() or App.cmd_down() then return end