1179774 - The page is incorrectly displayed when it is zoomed in/out with async scrolling feature enabled

Status: RESOLVED WORKSFORME

(Core :: Panning and Zooming, defect)

Description

[Vasilica Tamas, QA [:vtamas]]

Reproducible on: Firefox 42.0a1 and Firefox 41.0a2 across all platforms 

STR
1.Launch Firefox.
2.Make sure that e10s is enabled.
3.Go to about:config
4.Set layers.async-pan-zoom.enabled to true
5.Navigate to www.facebook.com
6.Zoom in/out the page.
 
ER
The page is correctly displayed when it is zoomed in/out.

AR
Several graphical issues appear when the page is zoomed in/out.

Additional notes:
- This issue is reproducible on Firefox 42.0a1 (2015-07-01) and Firefox 41.0a2 (2015-07-02) under Windows 7 64-bit, Ubuntu 14.04 32-bit and Mac OS X 10.9.5
- Tested using the first 10 sites from Alexa Top and this issue is reproducible across all of them (Google, Facebook, Youtube, Baidu, Yahoo, Amazon, Wikipedia, Qq, Taobao, Twitter)
- I am attaching several screenshots:
	- http://i.imgur.com/QCnHUjJ.jpg
	- http://i.imgur.com/BfNEuTA.jpg
        - http://i.imgur.com/Ti0RqGs.jpg	
        - http://i.imgur.com/EsmBBPX.jpg

Comment 1

[Kartikaya Gupta (email:[e-mail])]

What are you using to zoom in/out? I tried this with ctrl+/- on OS X and was not able to reproduce these issues.

Comment 2

[Mayank Bansal]

I am seeing this too. Reproducible on every site, with Win7.

I have to use the synaptics touchpad to zoom-in.  After the page has zoomed in, press ctrl+0 to reset zoom. The page doesnt zoom back correctly.

Comment 3

[Vasilica Tamas, QA [:vtamas]]

(In reply to Kartikaya Gupta (email:[e-mail]) from comment #1)
> What are you using to zoom in/out? I tried this with ctrl+/- on OS X and was
> not able to reproduce these issues.

I was able to reproduce this issue using all zooming methods:
- "Ctrl" and "+"/"-"  keyboard buttons (on desktop)
- "Ctrl" + mouse Scroll wheel (on desktop)
-  pinch gestures (on a touch device)

I forgot to mention that this issue is not reproducible with layers.async-pan-zoom.enabled set to false.

Comment 4

[Timothy Nikkel (:tnikkel)]

I can reproduce some wierdness on news.qq.com. Ctrl-+ many times, scroll left or right, ctrl-- many times. You can scroll the site left and right. Without apz you can't.

Comment 5

[Kartikaya Gupta (email:[e-mail])]

Are you still able to reproduce this on the latest nightly? APZ is on by default on nightly now and I haven't heard of anybody else seeing this. I also cannot repro locally.

Comment 6

[Vasilica Tamas, QA [:vtamas]]

I was not able to reproduce this issue on Firefox 43.0a1 (2015-08-17/18) and Firefox 42.0a2 (2015-08-17/18) under Windows 8.1 32-bit, Mac OS X 10.10.4 and Ubuntu 14.04 32-bit.

Based on my testing I am marking this bug as WFM.