1046504 - [System] Press home key wile orientation changed would shrink app window abnormally

Status: RESOLVED DUPLICATE of bug 1042260

(Core :: Panning and Zooming, defect)

Description

[Greg Weng [:snowmantw][:gweng][:λ]]

STR:

1. Hold phone in landscape mode
2. Open an app allowed orientation change
3. Press home key while it's doing the change

Expect:

Back to Homescreen without any issue

Actual:

Homescreen would become 1/4, and then (if re-do the STR again) 1/8, and then 1/16...

User can manipulate the shrunk app. And to open other apps they're all in the normal size.

It would occur on both horizontal and vertical Homescreen, and in some case, is the opened app got shrunk, not Homescreen. User can still press home key to Homescreen, which is in normal size.

Videos:

http://youtu.be/tlTtgWKYso8 
http://youtu.be/kJt8DGP_zpo
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Reproducible on these builds (Flame):

Gaia c72257b2
Gecko BuildID 20140724160202

Gaia b67ddd7d
Gecko BuildID 20140730160200

Gaia 

Tried to reproduce it on Tarako but it's unreproducible

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This bug sometimes is very easy to reproduce, especially when you success once. However, the repo rate is not 100%, so there may be some racing issues.

Don't know whether the number of media files in the database affects the repo rate or not. Maybe to scan large database would make it easier to reproduce.

Comment 1

[Greg Weng [:snowmantw][:gweng][:λ]]

NI Alive to see if we can have a possible root cause.

Comment 2

[(Inactive after June) George Duan [:gduan] [:喬智]]

I will investigate it.

Comment 3

[(inactive after 6/18) Alive Kuo [:alive]]

It seems the size of homescreenWindow is correct (width 320, height 539) when this occurs. Both the div.appWindow and browser iframe are. I am not sure but this might be a graphic issue.

Comment 4

[Greg Weng [:snowmantw][:gweng][:λ]]

NI Jerry to see who can be NI to handle this bug, since this seems not a Gaia bug after all, and after turn APZ off, it become unreproducible or hard to reproduce.

Comment 5

[(Inactive after June) George Duan [:gduan] [:喬智]]

As comment 3 stated, it might require gecko's team to investigate first.

Comment 6

[Jerry Shih[:jerry] (UTC+8) (inactive)]

Hi Kats,
Is it related to apzc? Does apzc need to handle the orientation window size change?

Comment 8

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

Is this the same as bug 1042260?

The apz code should already be handling size changes from rotations but maybe there's a bug. I'll try to repro; leaving needinfo on me for now.

Comment 9

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

I'm not able to reproduce on the build I have on my Flame at the moment. Will sync up to the latest master and try again.

Comment 10

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

I'm still unable to reproduce on the latest master. In the video it looks like your gallery app has only two images, is that correct? My gallery has a bunch of images so if you have only two I can try deleting the rest of mine. Also when I start the gallery in landscape it always renders in portrait for a brief instant before it switches to landscape. It doesn't look like that is happening in the video.

Comment 11

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

I can reproduce with different STR:

1. Open gallery (I deleted all but two images, not sure if that matters)
2. Rotate to landscape
3. Long-press the home button to bring up the app switcher
4. Rotate to portrait
5. Press the home button again to dismiss the app switcher and go back to the homescreen

At this point the homescreen will be shrunken. This does look like an APZC issue so I can look into it.

Comment 12

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

... and I can no longer reproduce this. :(