2050210 - [Vertical tabs] Tab Group border renders as a distorted/wavy vertical line when dragging a Split View into the group

Status: NEW

(Firefox :: Tabbed Browser: Split View, defect)

Description

[Camelia Badau [:cbadau], Desktop Test Engineering]

Attachment: issueSplitIntoTabGroups.webm

Found in

• Nightly 154.0a1

Affected versions

• Nightly 154.0a1

Tested platforms

• Affected platforms: Windows 11, Ubuntu, macOS 13 ARM

Preconditions

• browser.nova.enabled is set to true in about:config
• The Sidebar is displayed in the narrow (collapsed) state.
• Turn ON Vertical Tabs
• One Split view is created
• An open Tab Group exists

Steps to reproduce

• Drag the Split view into the Tab Group.
• Observe the Tab Group border/highlight.

Expected result

• The Tab Group border/highlight should render as a straight, properly aligned line when a Split View is dragged into the group.

Actual result

• The Tab Group border/highlight appears as a distorted, wavy vertical line. Please see the attachment.

Regression range

• Not applicable.

Additional notes

• Performing another action (e.g., clicking a tab) causes the line to render correctly again.
• The issue is also reproducible without Nova.