tdf#64991 Remove unnecessary special case from IdctHint hackHEADmaster

In order to emulate sprmCIdctHint support, the DOC importer uses a hack
which splits the input text at script type changes and overrides fonts
to make Writer's output match Word's.

One special case in this algorithm was to override treatment of
ASCII-range weak characters as Latin script. This special case had the
unfortunate side effect of causing serious performance problems with
non-Latin DOC files, as what would otherwise be treated as normal text
was split into an excessive number of spans at any ASCII-range weak
character (including space characters). This special case was also
unnecessary, as our default implementation already handles these
characters the same way Microsoft Word does.

This change deletes that special case. This should resolve the
performance issue, and shouldn't otherwise affect document layout.

Since this hack was added, Writer has gained support for its own version
of script type hinting. Currently, that implementation isn't perfectly
compatible with DOC/DOCX, but in the future we should be able to delete
this entire workaround and support sprmCIdctHint natively.

Change-Id: I25ffe38efc963b8d569e2911c64a70852e22c679
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/187602
Tested-by: Jenkins
Reviewed-by: Jonathan Clark <jonathan@libreoffice.org>

0 files changed, 0 insertions, 0 deletions