Huge mergeinfo list after merge from vendor branch

[Stefan Eßer]

We have gathered lots of mergeinfo junk in the source tree over the
decades, but I did not know it was so bad ...


I had not performed any merges for a long time and now that I have
to merge from the vendor branch to contrib in -CURRENT, I'm surprised
by the long mergeinfo list I got:

$ svn propget svn:mergeinfo -R /usr/src/contrib/bc
. - /projects/bectl/contrib/bc:336666-337662
/projects/bsd_rdma_4_9/contrib/bc:319973-326168
/projects/bsnmp-improved-ipv6-support/contrib/bc:301868
/projects/building-blocks/contrib/bc:275142-275143,275198,275297,275306-275307,275309,275311,275556,275558,275600,277445,277670,277673
/projects/clang-sparc64/contrib/bc:262258-262612
/projects/clang-trunk/contrib/bc:283596-287505
[...]
/vendor/bc/dist:362987-363077
/vendor/device-tree/dist/contrib/bc:303380
/vendor/resolver/dist/contrib/bc:1540-186085

A total of 56 lines, which are not relevant to this software, except for
the 3rd last line:

/vendor/bc/dist:362987-363077

Before causing a mess in the repo by committing the merged sources,
I'd like to know whether this is "normal" behavior, or whether I need
to clean up the mergeinfo before the commit.

Thanks in advance, STefan

PS: The committers handbook has quite some information regarding this
kind of merge, but it makes me think that only the relevant mergeinfo
line should have been registered ...