Avoid breaking after an empty frame #6335

EpicEricEE · 2025-05-26T22:08:32Z

Fixes #2914 and – to some extent¹ – the first part of #6125
Fixes #4972
Fixes #5977
Fixes #6304

What was wrong?

When a breakable block is split into multiple regions, and the first region is too small to fit any part of the block, it would previously add still add an empty frame to that region. However, when the block contains another breakable block, which also doesn't fit into the first region, the originally empty frame isn't empty anymore, as the empty frame from the nested block is added to it. This is what lead to #2914, where the no longer empty frame unexpectedly gets a fill.

Even when there is no nested block, and the empty region remains unfilled, it is still considered as part of the block. Thus, when it is laid out, its height is subtracted, making the remaining (and actually visible) part of the block smaller then expected, as pointed out in #2914 (comment).

A third issue ~~that could have surfaced in the future~~ is that this invisible "leftover" part could be enough for a block to count as sticking to a preceding block, even though the visible part would actually only be in the next region. ~~This isn't an issue yet, as sticky blocks currently lose most of their breaking capabilities as soon as something sticks to them, but #6020 already planned on changing that.~~ This is likely what lead to #5977.

The problem with labels is that when one is added to an empty frame, the frame is no longer considered empty. Since empty frames are ignored when making two elements stick together, the addition of the label breaks the stickiness, leading to #6304.

What changed?

The fix itself is quite simple, and just includes the same empty-frame check, which is also used when skipping the fill and stroke for a first empty frame. This check is put where labels are attached, and again right before the spill is created, so that instead of breaking the child, it can be entirely moved into the next region when (only) the first frame is empty. For cases where all frames are empty (e.g. explicitly sized blocks without content or fill), spilling and labeling remains allowed.

Two tests have failed with this change, but the updated references seem more correct to me:

In grid-header-containing-rowspan, the last cell on the first page is no longer stroked as there is nothing inside it. I assume this was the same issue as #2914, though I might have misinterpreted the test.
In grid-header-orphan-prevention, the "B" in the first header was previously too bold (drawn multiple times?). I'm not sure what happened there, but it seems to be fixed now.

The underyling issue isn't limited to the effect of empty orphan frames; a breakable block with regions of different width suffices. ↩

PgBiel

I'm impressed such a small change produced the desired effect here, very smart! Although I haven't looked too deep into it yet to tell whether this could produce some regression of some sort. Still, nice find!

A third issue that could have surfaced in the future is that this invisible "leftover" part would be enough for a block to count as sticking to a preceding block, even though the visible part would actually only be in the next region.

I actually faced this just yesterday! A block had a very tiny empty leftover at the previous page (everything else was at the next page), causing a heading right before it to appear to be an orphan (I even double-checked my show rules 😂), but adding fill to the block revealed that the sneaky thing was still in the previous page by a few pixels. Would be certainly nice to have this not happen anymore.

The fix itself is quite simple, and just includes the same empty-frame check, which is also used when skipping the fill and stroke for a first empty frame. This check is put right before the spill is created, so that instead of breaking the child, it can be entirely moved into the next region when (only) the first frame is empty.

So, if I understood correctly, you took code specific to block elements with fill and stroke and copied it to the flow layouter to avoid creating an empty frame entirely, not only skipping its fill and stroke? And by doing this, the fix bubbles up into a parent block containing a spilled breakable block, as its first frame also becomes entirely empty as well? That would seem decently robust in principle.

In grid-header-containing-rowspan, the last cell on the first page is no longer stroked as there is nothing inside it. I assume this was the same issue (...) though I might have misinterpreted the test.

The test was entirely unrelated, so I think I just didn't care about it back then. But yes, it's the same issue: an auto row is skipped to the next page if the first frame is empty, but here it wasn't empty, as the block containing lorem had, itself, created a nested empty frame, if I'm understanding correctly. So the new output seems correct to me!

In grid-header-orphan-prevention, the "B" in the first header was previously too bold (drawn multiple times?). I'm not sure what happened there, but it seems to be fixed now.

Wow! I think I noticed this at the time, but had no idea either and just ignored it. That is actually funny, I wonder what triggered this?
Seems like the header was placed normally once and then immediately repeated, but somehow it escaped to the next region or something 🤔

Maybe we could test these changes on top of #6168 to see if anything else changed?

EpicEricEE · 2025-05-27T10:24:31Z

So, if I understood correctly, you took code specific to block elements with fill and stroke and copied it to the flow layouter to avoid creating an empty frame entirely, not only skipping its fill and stroke? And by doing this, the fix bubbles up into a parent block containing a spilled breakable block, as its first frame also becomes entirely empty as well?

Exactly. The original check is

typst/crates/typst-layout/src/flow/block.rs

Lines 209 to 214 in 2a258a0

    
           let mut skip_first = false; 
        
           if let [first, rest @ ..] = fragment.as_slice() { 
        
               skip_first = has_fill_or_stroke 
        
                   && first.is_empty() 
        
                   && rest.iter().any(|frame| !frame.is_empty()); 
        
           }

This check remains necessary, as otherwise, the first region would not be empty anymore when it reaches the spill check.

Wow! I think I noticed this at the time, but had no idea either and just ignored it. That is actually funny, I wonder what triggered this?
Seems like the header was placed normally once and then immediately repeated, but somehow it escaped to the next region or something

In case you want to investigate this further, here's an MRE where a header with rowspan is currently drawn multiple times (once with "1" and once with "2"), though this is also no longer the case after this PR:

#set page(paper: "a11")
#let count = counter("g")

#lorem(2)
#table(
  table.header(
    table.cell(rowspan: 2, count.step() + context count.display()),
  ),
  [C]
)

Maybe we could test these changes on top of #6168 to see if anything else changed?

Done, no other tests have changed

Instead, spill the whole child into the next region to prevent small leftovers to influence layout. This is not done when all frames are empty (e.g. for an explicitly sized block without content or fill). This helps with the following cases: - Previously, if a sticky block was followed by a leftover frame, the stickiness would be ignored, as the leftover was in fact sticking. This is not currently a problem, as sticky blocks aren't really breakable at the moment, but probably will be in the future. - When ignoring stroke and fill for a first empty frame, a nested broken block would previously make the first frame not be considered empty anymore, which would lead to the leftover frame being filled. - Similarly, when the fill of an explicitly sized block is ignored in the first empty frame, the leftover part would still be considered as laid out, making the actually visible block too small.

Adding a label makes a previously empty frame non-empty, but we want to keep orphans empty.

In `grid-header-containing-rowspan`, the first region is now correctly not stroked. Not sure what happened in `grid-header-orphan-prevention`, but the "B" in the first header was too bold before.

EpicEricEE · 2025-05-27T13:33:03Z

I realized we can also easily fix #6304 by not only skipping the fill/stroke, but also the label for empty orphan frames. Adding a label wraps the frame in another frame, making the wrapper frame not empty.

PgBiel · 2025-05-27T23:14:35Z

Adding a label wraps the frame in another frame, making the wrapper frame not empty.

Could this affect introspection, e.g. by changing the page returned by locate(<lbl>)? Maybe we should test that too.

Previously, this would result in a position on the first page.

EpicEricEE · 2025-05-28T11:09:26Z

The position would previously be on the page of the empty orphan frame, but now that it's no longer labeled, it's on the next page as expected. I've added a test for that.

PgBiel · 2025-06-01T04:17:38Z

Thank you. In principle, this seems sound to me, but I'll wait for @laurmaedje's opinion.

EpicEricEE · 2025-06-05T10:32:55Z

While looking a bit into #6388, I found that this introduces an infinite loop of moving the child into the next region for this case:

#set page(width: 70pt, height: 70pt, margin: 10pt)
#grid(block(sticky: true, fill: blue, width: 100%, height: 75pt))

Don't know if I should add a may_progress in the spill check, or if there's something wrong in the grid layouter.

laurmaedje

Sorry that it took so long for me to respond. I guess I evaded this PR 🙈 as the concept matter is so tricky and reviewing work on such things is even trickier than working on them.

However, upon looking into this a bit more closely, it seems like a nice approach indeed! It's pretty natural in the new-ish relayout paradigm.

While looking a bit into #6388, I found that this introduces an infinite loop of moving the child into the next region for this case:

Oof, infinite layout loops are always a pain. But I think a may_progress check in distribute.rs should fix it; see my comment on the relevant line.

Adding a label wraps the frame in another frame, making the wrapper frame not empty.

Could this affect introspection, e.g. by changing the page returned by locate()? Maybe we should test that too.

The frame labelling should have no effect on introspection. It's not used for that at all, it's just used to expose the label in SVG export, which was a feature request by someone at some point, for something animation-related.

The position would previously be on the page of the empty orphan frame, but now that it's no longer labeled, it's on the next page as expected. I've added a test for that.

Regardless of not being caused by the frame labelling change, this change is entirely natural. The observed position of the block depends on where in the frame the introspection tags end up. These are are sticky and will migrate to the next region with the block.

tests/suite/introspection/locate.typ

crates/typst-layout/src/flow/distribute.rs

laurmaedje · 2025-09-03T11:48:36Z

Also fixes #5977 :)

laurmaedje · 2025-09-08T18:24:38Z

Thank you! This is a very nice fix.

… upstream (#1) * Numbering implementation refactor (typst#6122) * Pin colspan and rowspan for blank cells (typst#6401) * Clean up some parser comments (typst#6398) * Autocomplete fixes for math mode (typst#6415) * Update docs for gradient.repeat (typst#6385) * Document how to escape lr delimiter auto-scaling (typst#6410) Co-authored-by: Laurenz <laurmaedje@gmail.com> * Improve number lexing (typst#5969) * Report errors in external files (typst#6308) Co-authored-by: Laurenz <laurmaedje@gmail.com> * Table multiple headers and subheaders (typst#6168) * Use the shaper in math (typst#6336) * Standardize trailing slashes in docs route paths (typst#6420) * Make a more descriptive definition of `module` (typst#6380) * Specify which CSL style is not suitable for bibliographies (typst#6306) Co-authored-by: Laurenz <laurmaedje@gmail.com> * Adjust source file API surface (typst#6423) * Do not force `math.mid` elements to have the Large math class (typst#5980) * List both YAML file extensions in 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<laurmaedje@gmail.com> * Add interface to disable timer (typst#6695) Co-authored-by: Derived Cat <hooyuser@outlook.com> * Add support for drawing COLR glyphs in SVG export (typst#6693) * Apply aspect ratio correction for linear gradients in PDF export (typst#6689) * Wrap raw blocks in `<code>` tag additionally to `<pre>` tag (typst#6701) * Support for raw syntax highlighting in HTML export (typst#6691) * Ensure that whitespace is not collapsed in inline raw blocks (typst#6703) * Show aliases of citation styles in docs and completions (typst#6696) * Correct CeTZ spelling (typst#6706) * Add `title` element (typst#5618) Co-authored-by: Laurenz <laurmaedje@gmail.com> * Make HTML data structures cheaper to clone (typst#6708) * Move `par`, `box`, and `block` to show rules in HTML export (typst#6709) * Support smartquotes in HTML export (typst#6710) Co-authored-by: Malo <57839069+MDLC01@users.noreply.github.com> * Avoid dangling reference output for HTML tests (typst#6711) * Support multiple fonts in math (typst#6365) * Add link to position field of grid.hline and grid.vline docs (typst#6670) * Rename `pdf.embed` to `pdf.attach` (typst#6705) * Include numbering in PDF bookmark (typst#6622) Co-authored-by: Laurenz <laurmaedje@gmail.com> * Document escaping semicolon, valid identifiers, and `state` tips (typst#6674) Co-authored-by: Andrew Voynov <37143421+Andrew15-5@users.noreply.github.com> Co-authored-by: Yaksher <yaksher.git@gmail.com> Co-authored-by: Laurenz <laurmaedje@gmail.com> * Ensure table headers trigger rowbreak (typst#6687) * Fix phrasing of iff (if and only if) in docs (typst#6713) * Remove redundant "This can be" from stroke docs of curve and polygon (typst#6715) * Fix curve docs for fill (refer to curve instead of rectangle) (typst#6714) * Add span to `html.frame` node (typst#6716) * Fix return type of `missing_method` (typst#6718) * Encoding fixes for HTML raw text elements (typst#6720) * Update RelativeTo to include tiling in docs (typst#6730) * Add missing 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docs on function params of `array.{sorted,dedup}` (typst#6756) * Add a link from `math.vec` to `math.{arrow,bold}` in docs (typst#6867) * Add a disclaimer about embedding PDFs (typst#6888) Co-authored-by: Laurenz <laurmaedje@gmail.com> * Improve examples in the docs for under/over functions (typst#6889) * Improve docs of `Celled<T>` params of `table` and `grid` (typst#6764) Co-authored-by: Laurenz <laurmaedje@gmail.com> * Fix off by one in tag expansion (typst#6900) * More useful `Debug` impls for `Tag` and `Location` (typst#6901) * Fix potential crash in `Debug` impl of `Property` (typst#6902) * Fix `Debug` impl for end tags (typst#6906) * Make `select_where!` usable outside of typst-library (typst#6910) * Fix footnote links in presence of styling (typst#6912) * Consistently ignore styles for tags (typst#6911) * Expand tags even a bit more around groupings (typst#6909) * Don't warn for zero-sized horizontal spacing in HTML export * Use `singleton!` for `HElem::hole` * Add way to attach role to closest element in HTML export * Add logical parent mechanism to HTML export * Generalize mechanism for root styles to HTML export * Support footnotes in HTML export * Add `default` argument to `array.join` (typst#6932) * Replace the non-existent `$math.arrow` with `$math.accent` in the docs for vector (typst#6918) * Initial Hayagriva bump (typst#6920) Co-authored-by: Laurenz <laurmaedje@gmail.com> * Use different colors for object keys and string-based values in JSON listings (typst#6873) * Support for outline in HTML (typst#6606) * Use Title Case for Doc Pages (typst#6936) * Improve the docs for dictionary (typst#6899) * Add an illustration for `par.{leading,spacing}` in docs (typst#6915) Co-authored-by: Andrew Voynov <37143421+Andrew15-5@users.noreply.github.com> Co-authored-by: Laurenz <laurmaedje@gmail.com> * Initial plan --------- Co-authored-by: Sam Ireson <107627922+samuelireson@users.noreply.github.com> Co-authored-by: PgBiel <9021226+PgBiel@users.noreply.github.com> Co-authored-by: Ian Wrzesinski <133046678+wrzian@users.noreply.github.com> Co-authored-by: cAttte <26514199+cAttte@users.noreply.github.com> Co-authored-by: Andrew Voynov <37143421+Andrew15-5@users.noreply.github.com> Co-authored-by: Laurenz <laurmaedje@gmail.com> Co-authored-by: Tobias Schmitz <tobiasschmitz2001@gmail.com> Co-authored-by: Max <max@mkor.je> Co-authored-by: 3w36zj6 <52315048+3w36zj6@users.noreply.github.com> Co-authored-by: Malo <57839069+MDLC01@users.noreply.github.com> Co-authored-by: T0mstone <39707032+T0mstone@users.noreply.github.com> Co-authored-by: Lachlan Kermode <lachiekermode@gmail.com> Co-authored-by: Y.D.X. <73375426+YDX-2147483647@users.noreply.github.com> Co-authored-by: Ilia <43654815+istudyatuni@users.noreply.github.com> Co-authored-by: Noam Zaks <63877260+noamzaks@users.noreply.github.com> Co-authored-by: Wannes Malfait <46323945+WannesMalfait@users.noreply.github.com> Co-authored-by: Ivica Nakić <ssemigr@gmail.com> Co-authored-by: +merlan #flirora <flirora@flirora.xyz> Co-authored-by: Connor K <sigstackfault@gmail.com> Co-authored-by: Said A. <47973576+Daaiid@users.noreply.github.com> Co-authored-by: Florian Bohlken <flibbo@gmail.com> Co-authored-by: Robin <mewmew@users.noreply.github.com> Co-authored-by: Adrián Delgado <11708972+adriandelgado@users.noreply.github.com> Co-authored-by: frozolotl <44589151+frozolotl@users.noreply.github.com> Co-authored-by: Jassiel Ovando <jassielovando@protonmail.com> Co-authored-by: Patrick Massot <patrickmassot@free.fr> Co-authored-by: Erik <tinger@tinger.dev> Co-authored-by: pog102 <85764555+pog102@users.noreply.github.com> Co-authored-by: Laurenz Stampfl <47084093+LaurenzV@users.noreply.github.com> Co-authored-by: Niklas Eicker <git@nikl.me> Co-authored-by: Marcono1234 <Marcono1234@users.noreply.github.com> Co-authored-by: Igor Khanin <igor@khanin.biz> Co-authored-by: hpcfzl <hopcfizl@gmail.com> Co-authored-by: zefr0x <65136727+zefr0x@users.noreply.github.com> Co-authored-by: Abdul-Rahman Sibahi <asibahi@users.noreply.github.com> Co-authored-by: 枚鴉 <ling@omots.io> Co-authored-by: Myriad-Dreamin <35292584+Myriad-Dreamin@users.noreply.github.com> Co-authored-by: Derived Cat <hooyuser@outlook.com> Co-authored-by: Sebastian Eberle <152992757+sebaseb98@users.noreply.github.com> Co-authored-by: Johann Birnick <6528009+jbirnick@users.noreply.github.com> Co-authored-by: Yaksher <yaksher.git@gmail.com> Co-authored-by: Tau <git@alice-carroll.pet> Co-authored-by: Martin Haug <mhaug@live.de> Co-authored-by: Théophile Cailliau <tjbcg@pm.me> Co-authored-by: Drodt <daniel.drodt@tu-darmstadt.de> Co-authored-by: Daniel Drodt <132357467+Drodt@users.noreply.github.com> Co-authored-by: ultimatile <ultimatile@users.noreply.github.com> Co-authored-by: Poh <167305720+pohlrabi404@users.noreply.github.com> Co-authored-by: Clemens Koza <clemens.koza@gmx.at> Co-authored-by: Siddhant Agarwal <68201519+siddhantdev@users.noreply.github.com> Co-authored-by: Philipp Niedermayer <eltos@outlook.de> Co-authored-by: Toon Verstraelen <Toon.Verstraelen@UGent.be> Co-authored-by: Eric Biedert <github@ericbiedert.de> Co-authored-by: Jan Romann <jan.romann@uni-bremen.de> Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>

PgBiel reviewed May 27, 2025

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EpicEricEE added 4 commits May 27, 2025 15:21

Add tests

606183c

Don't label empty orphan frames

02f07e7

Adding a label makes a previously empty frame non-empty, but we want to keep orphans empty.

Update references of existing tests

811996e

In `grid-header-containing-rowspan`, the first region is now correctly not stroked. Not sure what happened in `grid-header-orphan-prevention`, but the "B" in the first header was too bold before.

EpicEricEE force-pushed the empty-frames branch from 59c0736 to 811996e Compare May 27, 2025 13:28

Add test for location of migrated block

bef4e20

Previously, this would result in a position on the first page.

PgBiel mentioned this pull request Jun 3, 2025

Grid header orphan prevention #4972

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1 task

laurmaedje added layout Related to layout, positioning, etc. fix A bug fix. labels Jun 4, 2025

saecki mentioned this pull request Jul 16, 2025

Generate tagged PDF documents for accessibility #6619

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laurmaedje reviewed Sep 1, 2025

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tests/suite/introspection/locate.typ Outdated Show resolved Hide resolved

crates/typst-layout/src/flow/distribute.rs Outdated Show resolved Hide resolved

laurmaedje mentioned this pull request Sep 3, 2025

Heading / sticky block sometimes doesn't stick to following block-level quote #5977

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laurmaedje added the urgent Should be fixed before the next release. label Sep 3, 2025

EpicEricEE added 3 commits September 8, 2025 17:48

Merge branch 'main' into empty-frames

e03f159

Use less confusing label

3e6b514

Add may_progress check

fbaf15b

laurmaedje added this pull request to the merge queue Sep 8, 2025

Merged via the queue into typst:main with commit 0890dc5 Sep 8, 2025
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EpicEricEE deleted the empty-frames branch September 8, 2025 19:46

EpicEricEE mentioned this pull request Oct 27, 2025

Pagebreak may separate outline title from the first outline entry. #7063

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Avoid breaking after an empty frame #6335

Avoid breaking after an empty frame #6335

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EpicEricEE commented May 26, 2025 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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EpicEricEE commented May 27, 2025 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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EpicEricEE commented May 26, 2025 •

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EpicEricEE commented May 27, 2025 •

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