Affected versions

• Firefox 90.0
• Firefox 91.0b6
• Firefox 92.0a1

Affected platforms

• Windows 7 x86
• Windows 10 x64
• macOS 10.15
• Ubuntu 18.04 x64

Preconditions

• pdfjs.renderInteractiveForms - true

Steps to reproduce

1. Go to http://foersom.com/net/HowTo/data/OoPdfFormExample.pdf.
2. Type "ggggg" in one of the fields.
3. Click outside the field.

Expected result

• The letters are correctly displayed inside the field.

Actual result

• The bottom of the letters are cut .

Regression range

• This is a regression, I can't reproduce the issue on Nightly from 2020-07-20. I will try to find the range as soon as possible.

Additional notes

• This issue is more evident on Windows 7 than the other platforms.
• On Ubuntu the issue is reproducing only if the size of the page is changed.
• Issue is not reproducing while using High Contrast Themes.

I can also reproduce the issue on this site: https://www.irs.gov/pub/irs-pdf/f1040.pdf.

On macOS, at least, this originates with the pdf.js update in bug 1691143, and is related to the fact that it now sets font-size on the text in the form field; prior to this, the text there was slightly smaller and did not suffer from the clipping.

I tried to find the regression range as well. I got the same result.
last good: 2021-02-05
first bad: 2021-02-05
potential regressor: Bug 1691143

works for me

seems to be fixed by

2022-09-17T22:56:40.326000: DEBUG : Found commit message:
Bug 1776538 - Update PDF.js to cd35b9bfac85c00238cf0fa0f657a780f2a5ead6 r=pdfjs-reviewers,marco

Differential Revision: https://phabricator.services.mozilla.com/D150311