854135 - Context menus appear on the wrong screen in high DPIs with a multi-monitor setup

Status: RESOLVED DUPLICATE of bug 851952

(Core :: Widget: Win32, defect)

Description

[Josh Tumath]

User Agent: Mozilla/5.0 (Windows NT 6.2; WOW64; rv:22.0) Gecko/20130323 Firefox/22.0
Build ID: 20130323031040

Steps to reproduce:

1. Connect two monitors to your computer, left and right of eachother.
2. Set the left screen to be the primary monitor.
3. Set the DPI to 150%.
4. Open Firefox and put the window on the right monitor.
5. Maximise the window.
6. Click on the Firefox button or right click anywhere on the page.


Actual results:

The context menu appears on the other monitor.

Comment 1

[Mats Palmgren (inactive)]

Similar to bug 840881 on GTK, maybe the bug is in cross-platform code?

Comment 2

[Jonathan Kew [:jfkthame]]

The problem here is that the code to figure out which screen should be used, and to ensure the popup is entirely within the bounds of the screen, is broken - it incorrectly mixes Windows logical-pixel and physical device-pixel coordinates.

This is actually the same problem as bug 851952, just being manifested by different components. The patch there fixes it in my testing.

Closing as a dupe, therefore. Please re-open if the problem persists once bug 851952 has landed.