1909290 - [MacOS] Panels are displayed at the wrong size if app is positioned between two monitors of differing DPIs

Status: NEW

(Core :: Widget: Cocoa, defect, P3)

Description

[Jeremy Swinarton]

Steps to reproduce:

• On MacOS, use more than one display, where the displays have differing DPIs (e.g. a HiDPI laptop and a regular DPI external display)
• Open Firefox and position the window such that a part of the window is on both displays
• Open an element that is implemented by a <panel> element (e.g. tab hover preview, the app settings menu, downloads, etc.)

Actual results:

The panel appears much larger than it should OR much smaller than it should, depending on which display has the majority of the window.

Expected results:

The panel appears at the same size as if the window was positioned entirely on one display.

Comment 1

[Jeremy Swinarton]

Attachment: app-settings-dpi.webp

Comment 2

[Jeremy Swinarton]

Attachment: thp-dpi.webp

Comment 3

[Jeremy Swinarton]

Attachment: too-small.png

Comment 4

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

The Bugbug bot thinks this bug should belong to the 'Core::Widget: Cocoa' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.