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Commit dce92c6d authored by Tom Lane's avatar Tom Lane
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Rewrite tab completion's previous-word fetching for more sanity.

Make it return empty strings when there are no more words to the left of
the current position, instead of sometimes returning NULL and other times
returning copies of the leftmost word.  Also, fetch the words in one scan,
rather than the previous wasteful approach of starting from scratch for
each word.  Make the code a bit harder to break when someone decides we
need more words of context, too.  (There was actually a memory leak here,
because whoever added prev6_wd neglected to free it.)
parent 8f3362d4
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