1023459 - [B2G][Window Management]Scrolling past the bottom of a list causes list elements to shrink

Status: RESOLVED INVALID

(Core :: Panning and Zooming, defect)

Description

[Ross Kuhlman ([e-mail])]

Scrolling past the bottom of a scrollable object causes the object to zoom out. This affects pretty much any feature of any app that is scrollable. Web pages, the settings menu, messages, gallery and music are all affected.

The issue does not occur in v1.4

Repro Steps:
1) Update a Flame to BuildID: 20140610000223
2) Launch settings app.
3) Scroll down to bottom of settings list.
4) Continue to scroll down past bottom of settings list.

Actual:
The elements on the list appear to zoom out when scrolling past the list. observe the right edge of the list

Expected:
The elements do not zoom out.

v2.0 Environmental Variables:
Device: Flame v2.0
BuildID: 20140610000223
Gaia: 8d865839d932bfbd5e157f376f74d8cb12bfdd51
Gecko: 1d4046a8cb6c
Version: 32.0a2
Firmware Version: v10G-2

Notes:
https://www.youtube.com/watch?v=FP_o0WhKcg0
video link: https://www.youtube.com/watch?v=UPNealbxCgs&feature=youtu.be

Repro frequency: 100%
See attached: videos

Comment 1

[Jason Smith [:jsmith]]

kats - is this expected or a bug?

Comment 2

[Botond Ballo [:botond]]

(In reply to Jason Smith [:jsmith] from comment #1)
> kats - is this expected or a bug?

That would be the recently landed APZ overscrolling feature: bug 998025.

Comment 3

[Jason Smith [:jsmith]]

UX - Are you okay with the changes to the UX here as seen in the videos or not? If not, we'll need to re-evaluate design decisions made in bug 998025.

Comment 4

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

As Botond said, this behaviour is intentional. We have been working with Gordon from UX to tune the exact behaviour so yes, they should be ok with it. I'm going to close this bug as invalid for now but I'll leave the needinfo - reopen if needed.

Comment 5

[Stephany Wilkes]

Reopening this as it should have been flagged ui-review? for Gordon. Since there's no attachment, flagging ni? to Gordon so he can give review approval and let QA know if this should move forward exactly as is. 

We can resolve the bug after we're sure it's well and truly done. Thanks, all!

Comment 6

[Harvey]

Regression Window if needed:

B2G Inbound Regression Window

Last Working 
Environmental Variables: 
Device: Flame 
BuildID: 20140609154428 
Gaia: d64172b2df8b406183e4d6de0cab2494c6dcf211 
Gecko: 7fb68b04c53c 
Version: 33.0a1 
Firmware Version: v10G-2

First Broken
Environmental Variables: 
Device: Flame 
BuildID: 20140609155654 
Gaia: 901646a3279c66daa7621bebb62641779d8ae22c 
Gecko: 58cf55af0ec1 
Version: 33.0a1 
Firmware Version: v10G-2 

Last Working Gaia First Broken Gecko: Issue does NOT reproduce
Gaia: d64172b2df8b406183e4d6de0cab2494c6dcf211
Gecko: 58cf55af0ec1

First Broken Gaia Last Working Gecko: Issue DOES reproduce
Gaia: 901646a3279c66daa7621bebb62641779d8ae22c 
Gecko: 7fb68b04c53c

Gaia Pushlog: https://github.com/mozilla-b2g/gaia/compare/d64172b2df8b406183e4d6de0cab2494c6dcf211...901646a3279c66daa7621bebb62641779d8ae22c

Comment 7

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

Yeah that would be bug 1020045 which enabled overscrolling.

Comment 8

[Gordon Brander :gordonb]

This is not a bug. The overscroll effect includes some z-space movement. There is ongoing tweaking of the physics settings, but this is working as intended (not a bug but work undergoing refinement).