svn merge --ignore-ancestry modifies svn:mergeinfo?

[Gunther Popp <sv...@guntherpopp.de>]

Hello,

while playing around with some examples for the svn merge command, I 
noticed that svn:mergeinfo gets modified even when the option 
--ignore-ancestry is used. Here's an example:
-----
trunk> svn update
Revision 29.

trunk> svn propget svn:mergeinfo .
/branches/RB-1.0.0:18-28
/tags/PREP-1.0.0:17

trunk> svn merge --ignore-ancestry 
svn://localhost/e2etrace/tags/PREP-1.0.0 
svn://localhost/e2etrace/branches/RB-1.0.0
-- Zusammenführen der Unterschiede zwischen Projektarchiv-URLs in ».«:
U    src\java\e2etrace\timer\DefaultTimer.java
Konflikt in »src/java/e2etrace/timer/ITimer.java« entdeckt.
Auswahl: (p) zurückstellen, (mf) volle eigene Datei, (tf) volle fremde 
Datei,
         (h) Hilfe für weitere Optionen: p
C    src\java\e2etrace\timer\ITimer.java
U    src\java\e2etrace\trace\ITraceStep.java
A    src\java\e2etrace\trace\ITraceStepFactory.java
Überspringe »src\junit\e2etrace\timer«
A    src\junit\e2etrace\timer\DefaultTimerTest.java
 G   .

trunk> svn propget svn:mergeinfo .
/branches/RB-1.0.0:18-28
/tags/PREP-1.0.0:17
/trunk:27
-----

As you can see, the merge added /trunk:27 to svn:mergeinfo. AFAIK, 
self-referential mergeinfo is nothing that should happen anyway. And 
according to the docs, until a  new option --no-record is introduced, 
--ignore-ancestry should prevent Subversion from using or modifying 
svn:mergeinfo.

Has anybody else seen something like this? Is this considered a bug?

Thanks,

Gunther

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