Open Bug 2027431 Opened 2 months ago Updated 2 months ago

Tab group expands unexpectedly when a split view (or a tab group with multiple tabs) from another window is moved before it

Categories

(Firefox :: Tabbed Browser: Tab Groups, defect)

Product:
Firefox
Component:
Tabbed Browser: Tab Groups
Type:
defect

Tracking

()

Status:
UNCONFIRMED

People

(Reporter: mercichao, Unassigned, NeedInfo)

References

(Blocks 2 open bugs, Regression)

Details

(Keywords: regression)

Attachments

(2 files)

2026_03_28_23_17_12.mp4
243.04 KB, video/mp4
Details
2026_03_29_23_45_48.mp4
335.20 KB, video/mp4
Details
Attached video 2026_03_28_23_17_12.mp4 —

Steps to Reproduce

  1. Create a tab group and collapse it.
  2. Open another window and create a split view in that window.
  3. Drag the split view into the first window and drop it before the tab group.
  4. Observe that the tab group expands unexpectedly.
Blocks: 1980370
Attached video 2026_03_29_23_45_48.mp4 —

The problem also occurs when a tab group with multiple tabs from another window is moved before a collapsed tab group.

Summary: Tab group expands unexpectedly when a split view from another window is moved before it → Tab group expands unexpectedly when a split view (or a tab group with multiple tabs) from another window is moved before it
Blocks: tabs-dnd, tab-groups
No longer blocks: 1980370
Keywords: regression
Regressed by: 1997096
Component: Tabbed Browser: Split View → Tabbed Browser: Tab Groups

The severity field is not set for this bug.
:sthompson, could you have a look please?

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Flags: needinfo?(sthompson)
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