tdf#157028 sw: PDF/UA export: reduce the number of Span ILSEs

Currently every text portion produces its own Span ILSE, which means
there's at least one per line.

But that seems a bit excessive, let's try to merge the portions and
create new Spans only when needed, i.e. when the formatting properties
that are exported change.

ILSEs may even be nested, e.g. a Span may contain Link or Span.

This will only merge within one SwTextFrame; merging across split
SwTextFrames looks too difficult to implement.

Change-Id: Id9b02332c580266f78da048be80ecceff1b28eca
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/156299
Tested-by: Jenkins
Reviewed-by: Michael Stahl <michael.stahl@allotropia.de>

0 files changed, 0 insertions, 0 deletions