[Bug 53360] SXSSF removes characters before escaped Unicode control character

[bu...@apache.org]

https://issues.apache.org/bugzilla/show_bug.cgi?id=53360

--- Comment #1 from Martin Andersson <ma...@purplescout.se> ---
This issue has been unanswered for a few weeks now. Is there anything more you
need to review the patch?

The patch is only three lines of code and it makes the SXSSF api consistent
with the XSSF api when it comes to escaping cell string values.

When SXSSF writes string cells it iterates over the string locking for
characters that need escaping. The valid characters are kept in a buffer and
are flushed when an escaped character is written. The flushing part is missing
for Unicode control characters. That's what this patch adds.

We have used the patch in production for five weeks now without any insidents.

Please let me know if you need anything more.

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