Closed Bug 1533667 Opened 4 years ago Closed 4 years ago

Repeated messages break autoscroll to bottom


(DevTools :: Console, defect, P1)

66 Branch


(firefox-esr60 unaffected, firefox65 unaffected, firefox66+ verified, firefox67 verified)

Firefox 67
Tracking Status
firefox-esr60 --- unaffected
firefox65 --- unaffected
firefox66 + verified
firefox67 --- verified


(Reporter: nchevobbe, Assigned: nchevobbe)



(Keywords: regression)


(1 file)

This affects 66, not 65.
Running a mozregression to find the changes that introduced the regression

When a message was repeated, the bubble would appear and
slightly increase the message size (by 1px), making it
lose its bottom-anchoring. Then, if a new message came,
the console won't automatically scroll anymore.
This patch modifies the repeat bubble CSS so it doesn't
impact the message height, and add a test case in the
test which asserts the scroll to bottom feature.

Pushed by
Fix scroll to bottom with repeated messages; r=Honza.

:nchevobbe, does it affect 67 ?

Closed: 4 years ago
Resolution: --- → FIXED
Target Milestone: --- → Firefox 67

How common do you think is this for users to run into?
Can the fix wait for 67 or are you looking to uplift to 66?

Flags: needinfo?(nchevobbe)

I want to request an uplift on this. I ran into it, and someone using webpack development server too, which I guess is widely spread. The actual fix is a one line CSS change, so I'm confident about the uplift being safe.

Flags: needinfo?(nchevobbe)

Comment on attachment 9049465 [details]
Bug 1533667 - Fix scroll to bottom with repeated messages; r=Honza.

Beta/Release Uplift Approval Request

  • Feature/Bug causing the regression: Bug 1486870
  • User impact if declined: When a message is repeated in the console, it won't automatically scroll to the bottom, which is essential for console users
  • Is this code covered by automated tests?: Yes
  • Has the fix been verified in Nightly?: Yes
  • Needs manual test from QE?: Yes
  • If yes, steps to reproduce: 1. Go to
  1. Open the console
  2. In the page, click the info button until the console output overflows
  3. In the page, click the Log repeatable message button twice
  4. Click the info button a few more time

-> The console should still be scrolled to the bottom.

  • List of other uplifts needed: None
  • Risk to taking this patch: Low
  • Why is the change risky/not risky? (and alternatives if risky): One line CSS change (removing a margin) in DevTools + automated test
  • String changes made/needed:
Attachment #9049465 - Flags: approval-mozilla-beta?

Comment on attachment 9049465 [details]
Bug 1533667 - Fix scroll to bottom with repeated messages; r=Honza.

CSS fix for regression in 66. OK for uplift to m-r.

Attachment #9049465 - Flags: approval-mozilla-release+
Attachment #9049465 - Flags: approval-mozilla-beta?
Attachment #9049465 - Flags: approval-mozilla-beta-
Flags: qe-verify+

Confirmed the issue with Firefox 66.0b14.
Fix verified with 66_RC and 67.0a1 (2019-03-11) on Windows 10, macOS 10.12, Ubuntu16.04.

Flags: qe-verify+
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