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This is too hard to make robust. Problems include
- Reading input in different places causes lines to appear and disappear
- There is no easy way to sequence the asynchronous operations
following bg.
- Response to job control of user commands on some OSes (MacOS,
for example) is unpredicatble.
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This should be even simpler.
Also more fix ups for failed pattern diffs.
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Use ed to get minimal user interaction without needing
advanced terminal handling.
Improve test output of failures of pattern differences.
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Also new job options.
Also suppress debug error if rows or columns are reported as zero as
this is normal without a physical terminal.
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