SwModelTestBase: speed up export tests

Export tests used to do the following steps:

1) Import
2) Verify
3) Discard state
4) Import
5) Export
6) Import
7) Verify

Assuming that the cost of 2), 3) and 7) is almost zero, that leaves us
with 4 filter() invocations for every such "export" test. But it seems
to me, we can save one filter() call if we do it this way:

1) Import
2) Verify
3) Export
4) Import
5) Verify

The only trick is that verify should perform its verification by only
reading the document model. So adapt tests which mutated the doc model:
paste tests should be import tests, the rest only did mutation by
accident.

A 'make check' is 88 seconds faster for me with this, using -j8. (~12
minutes of CPU time saved.)

Change-Id: I40db8a9b9adaa99020acd718ba4ec3fd9bee3fb8
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/90077
Reviewed-by: Miklos Vajna <vmiklos@collabora.com>
Tested-by: Jenkins

0 files changed, 0 insertions, 0 deletions