1686451 - Toolbar menus/popups cut off on >100% scaled notebook-monitor when second monitor = main display

Status: NEW

(Toolkit :: UI Widgets, defect)

Description

[Martin]

Attachment: firefox-bug-01.jpg

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:84.0) Gecko/20100101 Firefox/84.0

Steps to reproduce:

Dual monitor setup:
Notebook monitor (display scaling >100%) below external monitor (set as main display).

Same results with 84.0.2, 85.0b8 and 86.0a1 and clean profiles.

Actual results:

Toolbar menus/popups (≡ & addons like uBlock etc.) are truncated when firefox is in fullscreen or as a window near the top of the screen.

Expected results:

Toolbar menus/popups should appear in full size.

Comment 1

[Martin]

Clarification: only the toolbar-menus on the notebook screen (125%, below main display) are cut off.

Comment 2

[Martin]

[Tracking Requested - why for this release]:

Comment 3

[Mike Conley (:mconley) (:⚙️)]

I suspect this is happening due to some layout issues in the XUL popup manager, so moving this there for now.

Comment 4

[Martin]

I have noticed that the same problem also occurs with thunderbird (78.6.1).

Comment 6

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

The bug has a release status flag that shows some version of Firefox is affected, thus it will be considered confirmed.