TortoiseMerge bug: Diff showing a duplicate of previous line instead of the correct (long) line content

Hello everybody,

when using TortoiseMerge Diff to see changes done in a file in a revision,
I realized that wrong content is shown. Instead of one long line in the
file, the diff view shows the previous line of text again.

*Simple steps to reproduce the problem:*
1. Have a short file of couple of lines, one of which is rather long -
example.xml attached
2. Have another copy of the file and select the two files for comparison
using TortoiseSVN > Diff

*Expected result:*
Correct content of the files is shown, like here (screenshot from another
comparison tool):

*​Actual result:*

​You see the long line is completely absent and instead the preceding line
is shown twice.
Same situation when opening the compare view from the Log Messages view,
regardless whether there are or aren't any actual differences among the
files.

I consider this a serious issue, because it prevents from successfully and
reliably reviewing the changes in files in the repository.

*My ToroiseSVN Version Information:*
TortoiseSVN 1.9.3, Build 27038 - 64 Bit , 2015/12/13 11:53:16
Subversion 1.9.3, -release
apr 1.5.2
apr-util 1.5.4
serf 1.3.8
OpenSSL 1.0.2e 3 Dec 2015
zlib 1.2.8
SQLite 3.9.2

Can anybody please confirm this is a bug or advise me otherwise?

Thanks in advance,
Ondrej

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• text/xml attachment: example.xml