Closed Bug 1387393 Opened 7 years ago Closed 7 years ago

APZ autoscrolling is broken on scaled screens

Categories

(Core :: Panning and Zooming, defect)

Product:
Core
Component:
Panning and Zooming
Version:
57 Branch
Type:
defect
Priority:
Not set
Severity:
normal

Tracking

()

Status:
RESOLVED DUPLICATE of bug 1386777

People

(Reporter: mitchell, Unassigned)

Details

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:57.0) Gecko/20100101 Firefox/57.0
Build ID: 20170803134456

Steps to reproduce:

With a 2160p screen, and 1.5x scaling on in Win10x64:

1. Turn on apz.autoscroll.enabled
2. Open a long page
3. Middle-click 


Actual results:

Page jumps to the bottom almost instantly. This is without any mouse movement. When mouse is moved about 30% of the page upwards, scrolling upwards begins. The page move *dramatically* faster per pixel of mouse distance from activation point (which is mysteriously above the mouse upon middle-click) than non-APZ autoscrolling. 


Expected results:

Page should not scroll until mouse is moved.

When I turn off screen scaling and restart Nightly, APZ autoscrolling works perfectly.

Tested on 57.0a1 (2017-08-03) (64-bit).
This should be fixed by the patch on bug 1386777.
Status: UNCONFIRMED → RESOLVED
Closed: 7 years ago
Resolution: --- → DUPLICATE
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