1848493 - Font character spacing broken after upgrading to Firefox 116.0.2 (Windows HiDPI scaling 150%)

Status: RESOLVED DUPLICATE of bug 1845828

(Core :: Graphics: Canvas2D, defect)

Description

[Karel Koubek]

Attachment: Firefox character rendering - comparison between 115 and 116 version.

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/116.0

Steps to reproduce:

After recent update to Firefox 116.0.2, I noticed that the default "Arial" font in Google Sheets is rendered substantially differently that previous Firefox releases and even other browsers (Edge, Chrome) - there is a much larger spacing between the font characters.

To be sure, that this is a recent regression and not a user error, I downloaded the previous Firefox version 115.0.3, where the rendering is fine and in line with other browsers.

Actual results:

The font rendering in 116.0.3 has larger spacing between characters, leading to broken formatting in web pages.

Expected results:

The font rendering should be the same as in Firefox 115.0.3 or other browsers, so the common products like Google Sheets are not visually broken.

Comment 1

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

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

Comment 2

[Karel Koubek]

Additional information - this bug shows only with Windows

Comment 3

[Karel Koubek]

Attachment: Firefox character rendering in comparison to other browsers

Here is a comparison of the font rendering to other browsers.

Comment 4

[Alice0775 White]

I can reproduce this issue on Firefox117.0b6 Windows10, Windows11 DPI=150%.

Regression window:
https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=57dfc72d508c3d7ac1e157efd4939c22f08d47fd&tochange=0c63392b51ad1d6ffc0f8ed81512d75f0ebd9511

Suspect: Bug 1838768

Comment 5

[Alice0775 White]

Fixed range:
https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=0633fc6a610e483da0f0ac5641f66a964420e697&tochange=79cd2eba90d36212245b0af31cbe00e4154a1c5a

Comment 6

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

:jfkthame, since you are the author of the regressor, bug 1838768, could you take a look? Also, could you set the severity field?

For more information, please visit BugBot documentation.

Comment 7

[Jonathan Kew [:jfkthame]]

I believe this was another manifestation of the same issue as bug 1845828, and according to comment 5, the patch there should have fixed it.