1849127 - Firefox view scrollbar is hidden after entering fullscreen

Status: RESOLVED DUPLICATE of bug 1849195

(Firefox :: Firefox View, defect)

Description

[Alexandru Trif, Desktop Test Engineering [:atrif]]

Found in

• 118.0a1 (20230816215210)

Affected versions

• 118.0a1 (20230816215210)

Tested platforms

• Affected platforms: Windows 10x64, Windows 10x86
• Unaffected platforms: macOS 12, Ubuntu 22

Preconditions

• browser.tabs.firefox-view-next: true
• History saved inside Firefox

Steps to reproduce

1. Open Firefox View and enter fullscreen.
2. Click on History and observe the scroll bar.

Expected result

• Only one scroll bar is displayed.

Actual result

• The scrollbar for history items is hidden. A total of two vertical and one horizontal scrollbars are displayed.

Regression range

• Last good revision: 02894ef3b6a83786a858970ffab93df460104f05
  First bad revision: 227599b3bc1767c97e843dcd92df60363e4fc4e6
  Pushlog:
  https://hg.mozilla.org/integration/autoland/pushloghtml?fromchange=02894ef3b6a83786a858970ffab93df460104f05&tochange=227599b3bc1767c97e843dcd92df60363e4fc4e6

Additional notes

• Attached a screen recording (Mozilla): link

Comment 1

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

:mkaply, since you are the author of the regressor, bug 1845470, could you take a look?

For more information, please visit BugBot documentation.

Comment 2

[Mike Kaply [:mkaply]]

So there are two separate issues here (both caused by the same patch).

1. overflow-y: auto; causes the scrollbar to disappear in fullscreen.
2. width: 100%; causes a horizontal scrollbar to appear in fullscreen.

Maybe my Javascript way wasn't so bad :).

Comment 3

[❌OOO Until Oct 7 ❌ Kelly Cochrane [:kcochrane]]

Should add overflow: hidden; on :root and remove width: 100%; on #pages in firefoxview-next.css

Comment 4

[Mike Kaply [:mkaply]]

I'm going to dupe this forward as another bug has a lot more detail.

Thanks for the report!