tdf#i165354 sw offapi DOCX: implement HyphenationKeepLine – part 1

ODF 1.0 feature hyphenation-keep, i.e. disabling hyphenation across
page etc. was implemented by shifting the full hyphenated line
(fixing also the DOCX layout interoperability, when value of the
useWord2013TrackBottomHyphenation MSO DOCX compatibility option is
true). To shift only the last word, add UNO paragraph property

com::sun::star::text::ParagraphHyphenationKeepLine

and the associated layout in Writer core, i.e. disabling
the hyphenation in the last line, instead of line shifting,
if the value of ParagraphHyphenationKeepLine is true.

Fix missing DOCX layout interoperability by mapping the unhandled
useWord2013TrackBottomHyphenation = false case to the new layout.

Note: shifting lines may be better for languages with long
words, but only with 1) typesetting with line-level (greedy)
line breaking instead of the desirable paragraph-level, 2) and
with missing optimized hyphenation at boundaries of compound word
constituents, and 3) forgotting the following: Shifting only words
or word constituents are better for 1) equal line count on pages
and spreads (very basic typographical requirement), 2) disabling
hyphenation really (shifting doesn't guarantee this, because
shifting is limited in a single line, but the previous line can be
hyphenated, too) and 3) more compact typesetting.
Both hyphenation-keep algorithms are important for interoperability,
but the new HyphenationKeepLine can create state-of-the-art automatic
typesetting with the planned improvements.

Follow-up to commit 9574a62add8e4901405e12117e75c86c2d2c2f21
"tdf#132599 cui offapi sw xmloff: implement hyphenate-keep".
and commit c8ee0e8f581b8a6e41b1a6b8aa4d40b442c1d463
"tdf160518 DOCX: import hyphenation-keep to fix layout".

Change-Id: Iafa352ec91bbd5d1d227b8480337fa2b9acb5993
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/181954
Reviewed-by: László Németh <nemeth@numbertext.org>
Tested-by: Jenkins

1 files changed, 1 insertions, 0 deletions

diff --git a/svx/sdi/svxitems.sdi b/svx/sdi/svxitems.sdi
index 0f3da887b64c..0415b6955dd9 100644
--- a/svx/sdi/svxitems.sdi
+++ b/svx/sdi/svxitems.sdi
@@ -277,6 +277,7 @@ struct SvxHyphenZone
     INT16       HyphenZone    MID_HYPHEN_ZONE;
     BOOL        HyphenKeep    MID_HYPHEN_KEEP;
     INT16       HyphenKeepType MID_HYPHEN_KEEP_TYPE;
+    BOOL        HyphenKeepLine MID_HYPHEN_KEEP_LINE;
     INT16       MinLead       MID_HYPHEN_COMPOUND_MIN_LEAD;
 };
 item SvxHyphenZone SvxHyphenZoneItem;