1493352 - Unclickable area at the top when using dual monitor with different DPI settings

Status: RESOLVED WORKSFORME

(Core :: Widget: Win32, defect, P3)

Description

[Steven]

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:62.0) Gecko/20100101 Firefox/62.0
Build ID: 20180830143136

Steps to reproduce:

1. Main display monitor on 150% DPI (3840x2160)
2. Secondary monitor on 100% (1920x1080)
3. Firefox maximize on secondary display


Actual results:

1. When I move the mouse to the top of the secondary display it is unclickable.
2. The whole top line of it is unclickable.


Expected results:

1. It should be clickable
2. When Firefox is maximize on main display the top lines are clickable.

Comment 1

[Paul_B]

Hi Steven,

Thank you for taking the time to report this.

However, I did not manage to reproduce the issue that you mentioned neither on the build that you provided nor on the latest Release Build (20180920131237). 

Could you please retest this using latest FF release and report back the results? When doing this, please use a new clean Firefox profile, maybe even safe mode, to eliminate custom settings as a possible cause (https://goo.gl/PNe90E).

Comment 2

[Steven]

Attachment: Window display settings

Comment 3

[Steven]

Hi Paul,

I am already using the latest FF, even tried creating a new profile but the problem still exists.
I have also attach my current window display settings.

Comment 4

[Steven]

Hi, any updates?

Comment 5

[Paul_B]

Hi Steven, 

I apologize for the late reply. I've tested this issue again after you provided the new attachment but for some reason, failed to reply. I was not able to reproduce the issue on the 2nd try eighter. 

Given the fact that the issue seems to be related to something that is specific to your setup, could you please try to find a regression range using Mozregression tool? Information on the tool is available at http://mozilla.github.io/mozregression/. Please don't hesitate to contact us if you encounter any problems.
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Comment 6

[Neil Deakin]

Might be related to 1446619.

Comment 7

[Raluca Popovici, Desktop QA]

I was able to reproduce this issue on Fx 86.0a1(2021-01-22) , win 10x64 with 2x external displays: a 4K (3840x2160) - scale 150% and a 1920x1080 - scale 100%.

Comment 8

[Jim Mathies [:jimm]]

• requires two monitors that have unique origins configured such that mouse placement matches

Comment 9

[Daniel Holbert [:dholbert]]

I can't reproduce, unfortunately.

I've got a setup that matches the reporter's setup (win10 64-bit, with comment 0 & comment 2's resolution / scale factors / monitor-positioning, with the 4K monitor assigned #2 and being on the right, and selected as being the "primary monitor"). I tried right-clicking all along the extreme top edge of a fullscreen'ed Firefox window on the 1920x1080 monitor, and the clicks were received everywhere (every click triggered a context-menu popups, indicating that they are being received).

Raluca (or Steven, if you can still reproduce): could you provide any more information about any additional special configuration or steps that you may have that might be relevant or needed to reproduce? Also: could you clarify where the unclickable area is? (comment 0 says "the top line" but I'm not sure if that's specifically the maximized Firefox window's titlebar, or the tab-strip, or a thin single-pixel-tall strip at the very top of the screen, or something else?)

Also, I'm curious if the results change if you rearrange your monitor positions in the Windows Display settings (the dialog shown in comment 2) For example, if you align the tops of the screens in that dialog, does this bug's behavior change? I'm not sure it would, but it's just a guess.

Comment 10

[Jim Mathies [:jimm]]

I can't reproduce either. Testing with two displays 150%/100%, moving maximized Firefox windows between them and looking for dead space at the top of the window. Note though that when dragging a window it will often normalize when moved between screens. That might mess with tryin g to reproduce.

Comment 11

[Raluca Popovici, Desktop QA]

I guess this is an intermittent issue because now I cannot reproduce it with the following settings:

1. Main display monitor on 150% DPI (3840x2160)
2. Secondary monitor on 100% (1920x1080)
3. Nightly 88.0a1 (2021-03-09) (64-bit) maximize on secondary display