Commit aa91dc0c (CWS-TOOLING: integrate
CWS sw32numbf01, 2009-09-08) replaced the SwDoc::ReplaceNumRule() call
with SwDoc::SetNumRule(), as the later handles list ids. This required a
decision if resetting of the indent attributes is needed or not, but it
did not document why resetting was chosen.

On the other hand, the current bugdoc shows why resetting is a bad idea:
this way if you paste into a numbered paragraph which has a non-zero
paragraph indent inherited from the numbering + zero indent as direct
formatting, then this later is lost during paste.

Change-Id: Ie5dcf6ed86c240fd61c4d5bfed886910aea3648f
Reviewed-on: https://gerrit.libreoffice.org/57727Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Jenkins