[REVIEW][3-5] fdo#39415 Writer collapsing table border painting fixes

[Michael Stahl]

hi all, to fix this LO 3.4 regression i've committed 3 patches, which
should be applied to libreoffice-3-5.

i've just pushed these to gerrit, which has strangely resulted in 3
reviews instead of the expected one, but you can look at these here:

https://gerrit.libreoffice.org/239
https://gerrit.libreoffice.org/240
https://gerrit.libreoffice.org/241

the thing i don't understand is how you would add sign-offs to these
before pushing them, but i haven't actually pushed a gerrit patch yet so
probably i don't understand it yet :)

in case gerrit doesn't work for the reviewer, the commit messages
contain the original master commit ids anyway for git-cherry-pick.