bug#31261: -i replaces symlinks with new file

[Daniel Bosk]

Hello,

Not sure if it's intended behaviour or not, but I didn't expect it and I 
found no note in the man-page either. Consider the following:

  echo "test" > testfile
  ln -s testfile testlink
  cat testfile testlink
  sed -i "s/test/fail/" testlink
  cat testfile testlink

The first cat will output "test\ntest". I would expect the second to 
output "fail\nfail" but it outputs "test\nfail". The reason is that sed 
has replaced the symlink with a new file instead of modifying the file 
the symlink points to.

Thanks,
Daniel

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