Add new hyphenation options to adjust hyphenation, like DTP software do
in accordance with typographic requirements:
– Paragraph/Column/Page/Spread end zone spin boxes to Hyphenate Across
section of Text Flow pane of paragraph settings;
– loext:hyphenation-zone-always, loext:hyphenation-zone-column,
loext:hyphenation-zone-page and loext:hyphenation-zone-spread
ODF extensions;
– widorp.cxx, guess.cxx: handle Column/Page/Spread end zones;
– guess.cxx: handle Paragraph end zone (without portions, yet).
According to their typography, languages with long words need better
adjustment of line break of the last full paragraph/column/page/spread
lines, than simply disabling hyphenation by the recent ODF hyphenation-
keep or its equivalent MS Word OOXML extension. DTP software use
paragraph and column/page/spread end zones to adjust the hyphenation
zones in the last lines, for example, setting Column end zone to the
150% percent of the Hyphenation zone, resulting less hyphenation, also
less short words parts at the end of the columns, pages and spreads,
increasing readability.
Note: the default OOXML hyphenation zone 18 pt (or its MS Word variants,
for example 21.25 pt) disables single letter or narrow 2-letter (li-,
fi-, i.e. fi ligature) hyphenations at 12 pt font height. Setting 27 pt
for Column end zone, all 2-letter hyphenation is disabled in last lines
of columns and pages.
Note: textflow.ui needs multiple adjustment definitions for correct work
of the multiple spin boxes.
Change-Id: I37bbb4da30de0ec75eb8636f70d8e16588c56ed1
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/183565
Tested-by: Jenkins
Reviewed-by: László Németh <nemeth@numbertext.org>
László Németh
7d384fb1c2