8ce9cf6200cb95fa2c2bbb41a810f5df914192c4
et is not attached to a terminal, still split lines for status updates. (flutter/engine#52681)
For illustrative purposes: ```sh $ et build | grep '.*' ``` ... should still get line-per-line status updates, but it does not without this patch. It's hard to write tests because of global state, so I've declined to do so at the moment. Closes https://github.com/flutter/flutter/issues/147903.
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