The last time it happened I think I hit page-up several times. But I don't remember if I was in an editable pane.
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assert(#State.lines == #State.line_cache)
if #State.lines ~= #State.line_cache then log(2, os.date('%Y/%m/%d/%H-%M-%S')..' assertion failure: '..tostring(#State.lines)..' ~= '..tostring(#State.line_cache)) assert(false) end
if #State.lines ~= #State.line_cache then
log(2, os.date('%Y/%m/%d/%H-%M-%S')..' assertion failure: '..tostring(#State.lines)..' ~= '..tostring(#State.line_cache))
assert(false)
end