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On the first read from a nonscrolling fifo, we insert after the buffer
contents (which is just "\n"), and later delete the redundant newline
(582c3c56b (Do not add trailing newline to non-scrolling fifo buffers,
2024-01-28)). This deletion invalidates inserted ranges passed to
BufReadFifo. Fix that.
The test uses another fifo to pass ranges. I guess it could use
"ui_out -until" as well but this seems simpler. The test script needs
a fd but 3 and 4 are already taken so use 5. I didn't find a portable
way to check if it's already taken.
Fixes #5255
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