The problem was in SwFrame::GetNextSctLeaf(): it called WrongPageDesc()
to find out if pLayLeaf is a container that is on an acceptable page,
but it was too aggressive, and discarded a split table cell that was in
a follow table (so later it'll be moved to a next page), but on the same
page.

The result was that a new page was created, but later in
::doInsertPage() we noticed this unnecessary page and removed it. The
effect of that was that the in-progress layout action's m_bIsAgain flag
was set to true, restart the layout again and again.

Given that in-table split sections never need to create a new page frame
for the follow section (the cell does this for us already), just don't
discard pLayLeaf when WrongPageDesc() finds it and we're in the split
section-in-table case.

Change-Id: Iea98a26c14fc1fb3154378eab24daa2fd6e84459
Reviewed-on: https://gerrit.libreoffice.org/43429Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Jenkins <ci@libreoffice.org>