1399150 - Subdialogs on "About:preferences" pages are too big when changing the page width to 600

Status: NEW

(Firefox :: Settings UI, defect, P4)

Description

[Hani Yacoub, Desktop QA]

Attachment: 600W-subdialogs.png

[Affected versions]: 
Nightly 57.0a1

[Affected platforms]:
Platforms: Mac OS X 10.12 and Mac OS X 10.10

[Steps to reproduce]:
1. Launch Firefox.
2. Go to "about:preferences".
3. Change the W to 600.

[Expected result]:
Subdialogs should be correctly displayed on pages with 600W.

[Actual result]:
Subdialogs  on "About:preferences" pages are too big when changing the page width to 600

[Note]

On Mac 10.12 only after reducing the W under 520 the subdialogs start to appear off screen.

Comment 1

[Ricky Chien [:rickychien] (inactive)]

After verifying on Fx56 beta, this issue seems to be an existing issue but it's unlikely to be a regression from photon-preferences. Current sub-dialogs doesn't have a nice RWD support, we should enhance it to make it better.

Comment 2

[Valentina Claudia Ona]

Attachment: 1c0c1f2e-d757-4f26-aef7-a5ba5c970517.jpg

I also verify this issue on Windows 10 x64 and Windows 10 x64 Surface Pro 4 and when you drop down "Default font" from Language and Appearance, the section is not displayed correctly (can see the contain).
For more information please check the screenshot.

Comment 3

[Jared Wein [:jaws] (please needinfo? me)]

For comment #2 we would need a new value of sizetopopup that uses the max(the width of the menu button, the width of the contents of the popup).