1669099 - [Omnibox Experiment] Checked checkboxes shown as numbers

Status: RESOLVED FIXED

(Firefox :: PDF Viewer, defect)

Description

[rugk]

Attachment: knut-checkbox-error.pdf

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:81.0) Gecko/20100101 Firefox/81.0

Steps to reproduce:

1. Go to https://cccsbg.at/about/Mitgliedsformular.pdf
2. Click some checkboxes.
3. Print.

Actual results:

The preview of the checkbox shown is fine.
But in the print preview and when printed, the cross is somehow disturbed and prints a number instead.

See knut-checkbox-error.pdf

Expected results:

Always show the checkbox as a cross.

---

Tested under Fedora 32 with the official Mozilla Firefox flatpak. about:support data: https://gist.github.com/rugk/a6ae56defc34b24bba1d7f89eb085327
New profile, I'm in the treatment group.

Comment 1

[rugk]

Attachment: This is how it looks when I filled in the PDF.

Comment 2

[rugk]

The "=" at the bottom of the PDF file are emojis that also have a print problem. I've filled this as Bug 1669097 however.
Also see comment 4 at that bug (https://bugzilla.mozilla.org/show_bug.cgi?id=1669097#c4) for a different display of checkboxes as filled rectangles

Other error, I'm not sure whether this is a bug or intended:

• as you can see in the screenshot Firefox still displays me an error bar at the top about a potential incorrect display of the PDF file

Comment 3

[rugk]

Attachment: PositiveExampleHSV

Comment 4

[rugk]

Attachment: PositiveExampleHSV.pdf

Comment 5

[rugk]

Notice there are also positive examples. https://www.hsv-golf.de/images/files/Mitgliedsformular_HSV-GOLF-2019.pdf e.g. prints the checkboxes well. (see the attached files PositiveExample*)

Comment 6

[Calixte Denizet (:calixte)]

This pdf is ill-formatted since the streams to render checkboxes don't contain correct font info.
For example for the first one, the appearance (DA) is:
"/ 12.00000 Tf 0.09226 0.09003 0.08394 rg\n"
and in appearance to render checked box (AP::N::Yes) it's the same.
It's expected to have a font name after the slash.
I guess that in such situation (for checkboxes and radio buttons) we could try to fallback on Zapf fonts.

Comment 7

[Calixte Denizet (:calixte)]

Fixed in:
https://github.com/mozilla/pdf.js/commit/37c86b2daac769e58e274c123a80ef9a256a2c10