Implements the ODF 1.2 paragraph attribute style:writing-mode-automatic,
and supporting runtime features. When set, this attribute allows
programs to automatically recompute the paragraph writing mode when the
contents of the paragraph have been edited.
The ODF standard does not suggest any particular algorithm for
automatically determining paragraph direction. This implementation uses
the rules from Unicode UAX #9 3.3.1.
Currently, LO will only automatically change the writing direction when
new text is typed or deleted. Other known interesting cases are already
tracked as separate enhancement requests.
Change-Id: I49eecea36952588dc98f2a98ebce712cd2846c0c
Reviewed-on: https://gerrit.libreoffice.org/c/core/+/193547
Reviewed-by: Jonathan Clark <jonathan@libreoffice.org>
Tested-by: Jenkins
Jonathan Clark
69e902d085