1292604 - Wrong window position on Windows 10

Status: NEW

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

Description

[dielektric]

Attachment: position.png

User Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:48.0) Gecko/20100101 Firefox/48.0
Build ID: 20160726073904

Steps to reproduce:

Moved windowed Firefox window to the left side to the monitor screen.
(NO Windows autosnap to corners)
Quit Firefox.
Started Firefox again.


Actual results:

Firefox after restart moves about 5 pixels to the right from left side of the screen.


Expected results:

Should be aligned with left side of screen.
I think the issue is: Windows 10 have smaller window borders, Firefox calculates classic border size from Win7.. and moves the windows to prevent unexpected hiding of the windows behind left screen side.

Comment 1

[Tooru Fujisawa [:arai]]

Even when opening a new window while Firefox is running, there is a gap between the left side of the screen and the right side of the window.
I don't see the gap on Windows 8, so this should be something specific to Windows 10.