Revert "bnc#882631: keep line visible if proportional line spacing is < 100%."

This reverts commit 339e5d44a2afa0f5309a970f1ff11968103e336a
and commit d1987a3eaccfc3add35e6b9f8307ede857c5468e
"fix sd_import_tests after e42c05c1f96832572e525d85d89590f56f5a29dd".

It would need more work and understanding, so just revert.
Also, the problem with bnc#882631 is somewhere else, though this helped too.