1811548 - Print: content is restricted to narrow width on MacOS

Status: VERIFIED FIXED

(Core :: Printing: Output, defect)

Description

[fonsvdplas]

Attachment: testcase 1 (from reporter): Tower of Hanoi.html

Steps to reproduce:

Open the HTML file attached (with file://...) and press Cmd+P. You can see the issue in the print preview, and in the generated PDF (example output available at https://github.com/fonsp/disorganised-mess/files/10468998/Tower.of.Hanoi.pdf ).

The HTML file is a version-pinned file generated by https://github.com/fonsp/Pluto.jl , a Julia programming environment.

Tested on Firefox MacOS, 105-109 with browserstack.com, and Firefox 109 MacOS locally.

Actual results:

The first pages are correct, but the last pages are mostly blank, and contain squished and occluded content (2 characters wide).

Expected results:

Printing the same document on Firefox Windows or another browser gives the correct result: no blank pages, no squished content.

Comment 1

[fonsvdplas]

Attachment: Tower of Hanoi.pdf

Example of erroneous output.

Comment 2

[BugBot [:suhaib / :marco/ :calixte]]

The Bugbug bot thinks this bug should belong to the 'Core::Printing: Output' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.

Comment 3

[Jonathan Kew [:jfkthame]]

This seems to be related to the use of display: flex... if I remove that property from the top-level <div> element, the print preview looks fine and no longer has the "bad" pages at the end.

cc'ing Daniel, in case this looks at all familiar as a flexbox/fragmentation issue.

Comment 4

[fonsvdplas]

I just got the same bug report on Windows, Firefox 109. So it looks like it's not just MacOS.

Comment 5

[Daniel Holbert [:dholbert]]

Yup, it's not macOS-specific -- I think any apparent platform-specific behavior here is just due to font differences which have subtle impacts on the layout.

I'm intending to look at this in more depth soon (hopefully later today), but I did notice earlier that I was able to make it reproduce on Linux with the attached testcase if I increased the print "Scale" to 140 (in the Print Preview dialog "more settings")

Comment 6

[Daniel Holbert [:dholbert]]

Attachment: testcase 2 (reduced)

Here's a reduced testcase, I think.

EXPECTED RESULTS: The colorful borders should be on the left & right edges of each page.

ACTUAL RESULTS: On pages 5 and 6, the orange borders are collapsed together; i.e. we think the element has zero (or near-zero) width.

As noted in the testcase, if you set width:100% to the teal element (the flex item), then the bug goes away. (Which is odd, because that doesn't actually impact the sizing of the element. It has flex:1 which is effectively equivalent to width:100% in this context.)

Comment 7

[Daniel Holbert [:dholbert]]

Attachment: screenshot of testcase 2 in print preview (collapsing on page 5)

Comment 8

[Daniel Holbert [:dholbert]]

Attachment: reference case 2 (just added `width:100%` to the flex item)

Comment 9

[Ting-Yu Lin [:TYLin] (PDT, UTC-7)]

Attachment: Bug 1811548 Part 1 - Don't evaluate physical available size when aContainerSize is provided.

Comment 10

[Ting-Yu Lin [:TYLin] (PDT, UTC-7)]

Attachment: Bug 1811548 Part 2 - Provide size overrides when creating ReflowInput for an overflow container flex item.

Testcase 001 and 002 test row-oriented and column-oriented flex container,
respectively. The "a" and "b" variant test box-sizing:border-box and
box-sizing:content-box, respectively.

Depends on D170034

Comment 11

[Pulsebot]

Pushed by [e-mail]:
https://hg.mozilla.org/integration/autoland/rev/6364c09acf06
Part 1 - Don't evaluate physical available size when aContainerSize is provided. r=emilio
https://hg.mozilla.org/integration/autoland/rev/d8a321301178
Part 2 - Provide size overrides when creating ReflowInput for an overflow container flex item. r=dholbert

Comment 12

[Web Platform Test Sync Bot [:wpt-sync] (Matrix: #interop:mozilla.org)]

Created web-platform-tests PR https://github.com/web-platform-tests/wpt/pull/38637 for changes under testing/web-platform/tests

Comment 13

[Cristina Horotan [:chorotan]]

https://hg.mozilla.org/mozilla-central/rev/6364c09acf06
https://hg.mozilla.org/mozilla-central/rev/d8a321301178

Comment 14

[Web Platform Test Sync Bot [:wpt-sync] (Matrix: #interop:mozilla.org)]

Upstream PR merged by moz-wptsync-bot

Comment 15

[Ardelean Oana, Desktop QA [:oardelean]]

Reproducible on a 2023-02-20 Nightly build on macOS 12 using the attached testcase.
Verified as fixed on Firefox 112.0b7(build ID: 20230326180212) and Nightly 113.0a1(build ID: 20230327211143) on macOS 12, Windows 10, Ubuntu 22.