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Layout: the part of an at-least row left on a page lines its cells up within the row's least height (#6645) - #6646
A table row with a least height that splits at the foot of a page lined the cells of the part left there up against the text the other cells keep. Word makes that part at least as tall as the row's height says and lines the cells up within it: a cell aligned to the middle starts half of what the height leaves over its text down, one aligned to the bottom all of it, whether the cell's text goes on to the next page or not.
The cases of #6645's file: how far the first line of the cells b (middle, several lines), c (middle, one line) and d (bottom, one line) stands below the first line of a (top) in the part left on the page, in points (Word for Windows 16.0.20625, compatibility mode 15, lines of 9.2 pt):
case
lines kept in a and b
Word
main
This branch
P01 at least 12.75 pt, two lines
1
1.80, 1.80, 3.60
0, 0, 0
1.78, 1.78, 3.55
P02 at least 20 pt, three lines
2
0.84, 5.40, 10.80
0, 4.60, 9.20
0.80, 5.40, 10.80
P03 at least 30 pt, four lines
3
1.20, 10.44, 20.76
0, 9.20, 18.40
1.21, 10.40, 20.80
P04 at least 50 pt, six lines
5
2.04, 20.40, 40.80
0, 18.40, 36.80
2.01, 20.40, 40.80
P05 no height, two lines
1
0, 0, 0
0, 0, 0
0, 0, 0
P06 no height, four lines
3
0, 9.24, 18.36
0, 9.20, 18.40
0, 9.20, 18.40
This branch includes #6580 and #6586, merged in as they stand, because it needs both: #6580 lines the cells whose text goes on up in the part at all, and #6586 has the least height of a part of an at-least row (RowLayout::floor). The two merge with each other and with main without a conflict in the code. When they are merged this shrinks to its own commit, f30bbaef: ten lines in crates/layout/src/table.rs and a test.
What changes, in crates/layout/src/table.rs:
align_in_part takes the row's least height into the height it lines the cells up within: kept, the lowest end of the text that stays, is at least floor less the row's bottom band, and no more than the room for text on the page. A cell whose text goes on is not lowered past that room either.
Tests, in crates/layout/src/tests/split_part_height.rs:
the_part_of_an_at_least_row_lines_its_cells_up_within_the_rows_least_height: a row of four lines in a top and a middle cell and one line in a middle and a bottom cell, with room for three lines. At least 6 pt taller than three lines, the middle cell that goes on starts 3 pt down, the one-line middle cell a line and 3 pt, the bottom one two lines and 6 pt; without a height they start 0, one and two lines down. Without the change: "Some(53.736008): the middle cell that goes on is 0 pt down".
cargo test -p wordcraft-layout --lib: 716 passed, 3 failed: auto_hyphenation_breaks_long_words, fragmented_hidden_text_lays_out_like_the_visible_text, hyphenation_and_proofing_follow_each_runs_language. They fail the same way on main in my container, which has no hyphenation patterns.
I did not run the full cargo xtask ci.
Compared with Word's PDFs:
The table above, and three more pages of the same kind (the row as its table's last one; 14 pt of room for the row of 12.75 pt; 36 pt for the row of 30 pt): the offsets are within 0.05 pt of Word's on all nine.
The height of the part as drawn. In Word its borders end with the least height (13.8 pt in P01, with 17.5 pt of room; 31.1 pt in P03, with 33 or with 36 pt of room); here they run down to the foot of the page as before. Close split table fragments at fitted content #2493 closes a split row's part at its content and would be the place for it.
Turned text, and pictures in the part, are lined up as before.
The review's finding is in #6580's code (align_in_part), so the fix is there, 9d303819, and merged in here: a cell that goes on is lowered by the row of a table it keeps down to that row's bottom border, not to its text alone. The table of Word's numbers is in the thread and in #6580. cargo test -p wordcraft-layout --lib on this branch: 718 passed, the same 3 fail; fmt and clippy clean.
Summary by CodeRabbit
Bug Fixes
Improved table layout when rows continue across pages. Split row segments now preserve the row’s minimum height, and middle- and bottom-aligned cells align with the content shown in each segment.
Fixed cases where alignment in a split row could affect the placement of following content.
Continuation segments now account for available page space and the table’s top border when meeting the minimum height.
Improved alignment when content continues across pages, including when other cells remain whole or contain nested rows.
…that tall (storytold#6585)
Word keeps a row's minimum height on every page the row runs over: the part that goes
on to the next page is at least as tall as the row's height says, the cells' margins
and border bands on top, with the text left for it at its top. WordCraft made that part
as tall as its text, so the rows and text after it started higher than in Word.
The row layout and its continuation now carry that least height, and place_table grows
the part that goes on to it, down to the page's bottom at most.
Measured in Word for Windows 16.0.20625 with rows at least 20 to 400 pt tall split over
two to four pages.
…op border, not the row's own (storytold#6585)
Word draws the table's top border at the top of the part of a row that goes on to the
next page, whatever the row's own top border is, and the part's least height counts
that border's band: in a table with lines between its rows and none around it the part
is as tall as the row's height says, and with a 3 pt top border 3 pt taller.
Measured in Word for Windows 16.0.20625 with a middle, a first and a last row in tables
with and without a top border and with 0.5 and 3 pt lines between rows.
… within the row's least height (storytold#6645)
A row with a least height that splits at the foot of a page lined the cells
of the part left there up against the text the other cells keep. Word makes
that part at least as tall as the row's height says and lines the cells up
within it: with one line of 9.2 pt kept in a row of at least 12.75 pt, a cell
aligned to the middle has it 1.8 pt down and one aligned to the bottom 3.6 pt,
whether the cell's text goes on to the next page or not.
`align_in_part` takes the row's `floor` into the height it aligns within.
Measured in Word for Windows with rows of at least 12.75, 20, 30 and 50 pt
keeping one to five lines, and with rows without a height.
No actionable comments were generated in the recent review.
Walkthrough
At-least table rows now retain a minimum height in continuation fragments when page space permits. Middle- and bottom-aligned cells in split rows align based on content retained in each fragment.
At-least rows carry a continuation height floor. The pagination loop grows carried fragments up to that floor when room permits. Tests cover continuation height, borders, and following-row placement.
Alignment within split fragments crates/layout/src/table.rs, crates/layout/src/tests.rs, crates/layout/src/tests/split_part_height.rs, docs/layout-parity.md
Middle- and bottom-aligned cells align based on content retained in the current fragment. Tests cover cell positions, continuation behavior, and paragraph placement. The parity notes describe the updated behavior.
This change aligns cells in split at-least table rows and keeps a minimum height on each part. It is limited to table layout and has regression tests. No merge-blocking risk is identified.
Pre-merge checks: 4
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Explanation
Title check
The title names the main change: the part of an at-least row left on a page now aligns its cells within the row's least height. The raw summary and objectives both describe this cell alignment change …
Linked Issues check
[#6645] Requirement: in a split at-least row, middle- and bottom-aligned cells in the part left on the page line up within the row's least height when that height exceeds the text kept there. Without …
Out of Scope Changes check
Changes map to three groups: 1. Alignment changes in align_in_part, the aligned flag in finish_table_rows, and the lowered return value used in split_row_with. These implement #6645. 2. `Row…
Description Check
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Full details: Title check
Explanation
The title names the main change: the part of an at-least row left on a page now aligns its cells within the row's least height. The raw summary and objectives both describe this cell alignment change in split at-least rows, linked to issue #6645. The title is specific and accurate. It is long (107 characters) and includes an issue reference, but it does not describe unrelated work.
Full details: Linked Issues check
Explanation
[#6645] Requirement: in a split at-least row, middle- and bottom-aligned cells in the part left on the page line up within the row's least height when that height exceeds the text kept there. Without a height, they line up against the text kept.
Evidence from the whole-PR diff (merge base 60415e0 to head 32df616) in crates/layout/src/table.rs:
RowLayout.floor is set only for HeightRule::AtLeast rows with a height (layout_table). Rows without a height keep floor at 0.0.
align_in_part sets kept = kept.max((row.floor - row.bottom).min(limit)) when any text is kept. It then computes part = kept + row.bottom, and centred or bottom cells are offset by (part - al.height) (halved for centre), so the least height is used.
Cells whose text goes on are lowered through lowered (own, kept, limit), so the middle and bottom cells that continue are aligned too.
The test the_part_of_an_at_least_row_lines_its_cells_up_within_the_rows_least_height in crates/layout/src/tests/split_part_height.rs covers middle, one-line middle, and bottom cells, with and without a height. The PR table reports offsets within 0.05 pt of Word's for the six repro cases and three more pages. I did not run the tests or the repro.
The drawn height of the split part is assigned to #2493 by the issue. Its absence is not a failure here.
Uncertainty: an incremental diff from the previous reviewed head (f30bbae) could not be read, because the changed blobs are missing from the checkout. This assessment uses the whole-PR diff against the merge base.
Full details: Out of Scope Changes check
Explanation
Changes map to three groups:
Alignment changes in align_in_part, the aligned flag in finish_table_rows, and the lowered return value used in split_row_with. These implement #6645.
RowLayout.floor, its computation in layout_table, and grow_to_floor. These come from #6586, which the PR includes and the issue names as a prerequisite. grow_to_floor changes the drawn height of continuation parts, which is the drawn-height topic that the issue assigns to #2493. This is a known tension, but it follows from the included #6586 prerequisite and is not an unrelated change.
Tests, and docs/layout-parity.md, which support the alignment change.
Documentation inaccuracy: the PR description says the drawn height is unchanged ("they run down to the foot of the page as before"). The code grows continuation parts to the floor through grow_to_floor. The description should be corrected. This does not make a change out of scope.
I did not find a file tied to unrelated work. I did not run the tests.
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Reviewing files that changed from the base of the PR and between dead7f1 and 32df616.
Files selected for processing: 3
crates/layout/src/table.rs
crates/layout/src/tests.rs
docs/layout-parity.md
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…art of a split row (storytold#6579)
The cells of the part left on a page lined up against the most text kept by
the cells that run from the top there. A cell aligned to the middle or the
bottom whose text all stays was left out, so beside one that was the tallest
the others stood too high.
Measured in Word for Windows: beside a centred cell of four lines that stays
whole and a top cell that keeps three, a centred cell of two lines starts one
line down, one of three half a line and a bottom cell of one line three lines
down; the same with the four-line cell at the top or at the bottom.
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Actionable comments posted: 1
Fix comments: Fix CodeRabbit comments on this PR
Prompt to fix all issues
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only still-valid issues, skip the rest with a brief reason, keep changes
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Inline comments:
Review comments at @crates/layout/src/table.rs:
- Line 1315: Adjust the displacement bound in the `split_row_with` flow so it
accounts for the geometry of retained nested rows, not only retained text
represented by `own`; use the retained-row information established by
`nested_keep_cut` to ensure a nested Can't Split row’s box cannot move across
the cut.
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Reviewing files that changed from the base of the PR and between 60415e0 and f30bbae.
Files selected for processing: 5
crates/layout/src/table.rs
crates/layout/src/table_flow.rs
crates/layout/src/tests.rs
crates/layout/src/tests/split_part_height.rs
docs/layout-parity.md
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…ow it keeps too, down to that row's bottom border (storytold#6579)
A middle or bottom cell whose text goes on is lined up in the part of the row
left on the page by what it keeps there. That counted text and pictures only.
A row of a table in the cell ends below its text, at its bottom border, so a
cell that kept such a row was lowered too far: the row's area crossed the
page's bottom and was cut there, also a row marked Can't Split.
`align_in_part` now counts the areas of the rows of tables that end above the
limit (the cell's own area runs to the row's bottom, past it).
Measured in Word for Windows: a bottom-aligned cell that keeps a nested row
with 30 pt of cell margin under its line, while the paragraph of three lines
after it goes on, has that row's bottom border where the text kept beside it
ends: 15 pt down with 62 pt of room and 24.2 pt down with 66; a centred cell
half as far. Eight pages; before this the row's line stood up to 30 pt lower
and the nested table was cut by the page's bottom, now within 0.2 pt.
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Fixes #6645.
A table row with a least height that splits at the foot of a page lined the cells of the part left there up against the text the other cells keep. Word makes that part at least as tall as the row's height says and lines the cells up within it: a cell aligned to the middle starts half of what the height leaves over its text down, one aligned to the bottom all of it, whether the cell's text goes on to the next page or not.
The cases of #6645's file: how far the first line of the cells
b(middle, several lines),c(middle, one line) andd(bottom, one line) stands below the first line ofa(top) in the part left on the page, in points (Word for Windows 16.0.20625, compatibility mode 15, lines of 9.2 pt):aandbmainThis branch includes #6580 and #6586, merged in as they stand, because it needs both: #6580 lines the cells whose text goes on up in the part at all, and #6586 has the least height of a part of an at-least row (
RowLayout::floor). The two merge with each other and withmainwithout a conflict in the code. When they are merged this shrinks to its own commit,f30bbaef: ten lines incrates/layout/src/table.rsand a test.What changes, in
crates/layout/src/table.rs:align_in_parttakes the row's least height into the height it lines the cells up within:kept, the lowest end of the text that stays, is at leastfloorless the row's bottom band, and no more than the room for text on the page. A cell whose text goes on is not lowered past that room either.Tests, in
crates/layout/src/tests/split_part_height.rs:the_part_of_an_at_least_row_lines_its_cells_up_within_the_rows_least_height: a row of four lines in a top and a middle cell and one line in a middle and a bottom cell, with room for three lines. At least 6 pt taller than three lines, the middle cell that goes on starts 3 pt down, the one-line middle cell a line and 3 pt, the bottom one two lines and 6 pt; without a height they start 0, one and two lines down. Without the change: "Some(53.736008): the middle cell that goes on is 0 pt down".Checked:
cargo fmt --all -- --checkcargo clippy -p wordcraft-layout --all-targets -- -D warningscargo test -p wordcraft-layout --lib: 716 passed, 3 failed:auto_hyphenation_breaks_long_words,fragmented_hidden_text_lays_out_like_the_visible_text,hyphenation_and_proofing_follow_each_runs_language. They fail the same way onmainin my container, which has no hyphenation patterns.cargo xtask ci.Compared with Word's PDFs:
mainwith Layout: a middle or bottom cell of a split row that goes on is lined up by the text it keeps (#6579) #6580 and Layout: every part of an at-least row split across pages is at least that tall (#6585) #6586) 4 change, all 4 closer to Word and none further. On top of my other open fixes 10 change, all 10 closer and none further: nine of them, lists of vehicles in rows of at least 12.75 pt with centred cells, end up word for word where Word has them (64 of the 91 do, from 55).Not done here:
Overlaps:
split_row_with); they don't touchalign_in_part.After the review (
32df6161)The review's finding is in #6580's code (
align_in_part), so the fix is there,9d303819, and merged in here: a cell that goes on is lowered by the row of a table it keeps down to that row's bottom border, not to its text alone. The table of Word's numbers is in the thread and in #6580.cargo test -p wordcraft-layout --libon this branch: 718 passed, the same 3 fail; fmt and clippy clean.Summary by CodeRabbit