Test struts in textless box.
Test vertical alignment vs line breaking interaction.
Test struts on paragraph with offset middle box.
Add paragraphLines to Rich ParagraphLayout.
BREAKING: The paragraphLines field of ParagraphLayout must be preserved
for pagination.
BREAKING: The width of a rich text ParagraphLayout will now remain
unchanged after pagination.
BREAKING: Empty space at the top of the first line and at the bottom
of the last line in a ParagraphLayout will now be preserved.
Add manual test for mixed vertical alignment.
Test mixed line height with varied alignment.
Add content rect to Fragment.
Test preservation of lines with boxes.
Test boxes with no text or only a space.
Allow trimmed whitespace to generate empty fragments.
BREAKING: Output may now contain more fragments with zero glyphs,
representing runs of whitespace that was trimmed away. These runs may
also start a box at the end of a line, instead of the beginning of the
next line.
BREAKING: Trimmed whitespace now affects line height.
Test with AlignStart by default.
Allow paragraphRect without point 0,0.
Test right-aligned paragraph.
Test handling of empty lines.
Make RTL text overflow the left paragraph edge.
This behaviour is consistent with CSS Text Module Level 3.
BREAKING: Previously, all text would overflow the right paragraph edge,
regardless of text direction.
Test ultra narrow Arabic text.
Test shaping across intra-word breaks.