The mirror of the left indent (fo:margin-right, w:ind w:right) with its own
marker on the ruler. ODF export rides the PBX sentinel: odf-kit has a paragraph
option for the left indent but none for the right one.
Clearing direct formatting now resets the first-line and right indents as well —
no named style governs either, so both are always direct formatting.
Only the block's left margin was read, so w:firstLine, w:hanging and
fo:text-indent were dropped: every hanging-indent paragraph rendered with
its first line flush with the rest instead of outdented.
Stored as the signed indentFirst attr in cm (negative = hanging) and
rendered as CSS text-indent. Word splits it into two exclusive
attributes by sign, ODF keeps one signed value.