1647755 - Odd text and layout stuff happening in latest Nightlies

Status: RESOLVED MOVED

(Core :: Layout: Text and Fonts, defect, P1)

Description

[Chris H-C :chutten]

Attachment: gcal screenshot

Sorry I can't be more specific, so this may end up being the absolutely wrong component, but stuff's a little weird on Windows, Mac, and Linux.

Clicking to select text on google docs selects text too far up on the page
Text in google docs is cut off at the bottom
Google calendar has overlapping
"My Dashboard" on BMO has layout overlapping
Slack's nicknames no longer have the expected font decorations

Nightly 2020-06-23

Comment 1

[Daniela Arcese [:daniela]]

Attachment: gdoc.png

Here is a screenshot of the "Text in google docs is cut off at the bottom" issue.
https://docs.google.com/document/d/1DgvdQYxyrSvkUQSOldRm9GhmbrnnOSu9xRFtIOzvrVs/edit Here is the link to that doc if it is helpful.

Comment 2

[Emilio Cobos Álvarez [:emilio]]

Is this with WebRender enabled? That Google docs bug seems similar to other recent WR bugs.

Does the "My Dashboard" stuff and so on go away shift-reloading / is it gone in the last update?

Comment 3

[Daniela Arcese [:daniela]]

(In reply to Emilio Cobos Álvarez (:emilio) from comment #2)

Is this with WebRender enabled? That Google docs bug seems similar to other recent WR bugs.

Does the "My Dashboard" stuff and so on go away shift-reloading / is it gone in the last update?

WebRender is disabled for me, and shift-reloading and updating did not change anything (I'm on 79.0a1 (2020-06-23) )

Comment 4

[Emilio Cobos Álvarez [:emilio]]

I can't repro, though given you can, is there any chance you could find what broke this?

Comment 5

[Daniela Arcese [:daniela]]

(In reply to Emilio Cobos Álvarez (:emilio) from comment #4)

I can't repro, though given you can, is there any chance you could find what broke this?

Yup, on it.

Comment 6

[Emilio Cobos Álvarez [:emilio]]

Thanks!

Comment 7

[Stefan Arentz | :st3fan | ⏰ EST | he/him]

Any table in google docs is incorrectly rendered for me.

Comment 8

[Daniela Arcese [:daniela]]

I couldn't narrow it down to a commit, as every build as far back as May 14 was broken for me (when running on my current profile). When using a fresh profile I never saw the issue. Let me know if there are other steps I can take.

Comment 9

[Emilio Cobos Álvarez [:emilio]]

Can we figure out what causes the brokenness in your profile?

The "Important Modified Preferences" section in about:support may be useful as a first start.

Comment 10

[Chris H-C :chutten]

That this occurred based on time across a wide segment of the mozilla population suggests to me a study/experiment. But all my studies in about:studies are complete. (I can't seem to find a location where experiments would be listed, actually).

Comment 11

[Emilio Cobos Álvarez [:emilio]]

We figured out, turns out that this is Firefox Private Relay adding an * { box-sizing: content-box } to the page... :/

Comment 12

[Chris H-C :chutten]

relay.css is adding a rule * { box-sizing: border-box; } which appears to be the problem. This suggests that an update to the Firefox Private Relay addon I have installed is causing the mess.

I confirm that disabling the FPR Addon fixes the problem.

Comment 13

[Chris H-C :chutten]

Looks like this was independently discovered on github: https://github.com/mozilla/fx-private-relay/issues/472