1417384 - Missing pixels in the corners on maximized window on high-density monitors

Status: UNCONFIRMED

(Firefox :: Theme, defect, P2)

Description

[imr]

Attachment: firefox57-fullscreen-missing-pixels-bug.JPG

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:57.0) Gecko/20100101 Firefox/57.0
Build ID: 20171112125346

Steps to reproduce:

1. Install Firefox 57.
2. Move Firefox window to highdensity monitor (laptop built-in 14 inch FHD display)
3. Click on Maximize Window.
Screenshot attached.


Actual results:

Maximized Firefox window leaves white pixels in the corners of the screen. In other words Firefox does not maximize properly as on normal density screens.


Expected results:

Firefox should look exactly the same on normal density and high density screens.

Comment 1

[imr]

Since it might be not obvious - the high density screen has a Windows DPI settings at 125%. The issue occurs also on 150% (Windows recommended) and 175%. Issue does not occur on DPI setting on 100%.

Comment 2

[imr]

FYI - Fixed in beta channel. I'm currently using version 58.0b7 and problem no longer exists.

Comment 3

[imr]

Regression in beta channel: 58.0b9 (64-bit).

Comment 4

[Jason W]

59.0b9 and Windows display scaling of 125%, with a maximized Firefox window I cannot click on the close button with the mouse cursor in the far upper right of the screen, nor can I grab the vertical scrollbar with the cursor on the far right edge of the screen.  With Firefox started in safe mode as well.