835656 - [Homescreen] Possible to display blank grid page by panning very fast

Status: RESOLVED WORKSFORME

(Firefox OS Graveyard :: Gaia::Homescreen, defect)

Description

[Ben Francis [:benfrancis]]

Originally reported on Leo, but also reproducible on Unagi.

STR:
* Pan left and right on homescreen quickly.

Sorry, that's the best I can do. This is quite hard to reproduce during normal use.

Video to follow.

Comment 1

[Ben Francis [:benfrancis]]

Please see video at http://www.youtube.com/watch?v=3Ozmvekxp_M

Comment 2

[Cristian Rodriguez (:crdlc)]

Maybe it is the same problem that I found here #827130

Comment 3

[Cristian Rodriguez (:crdlc)]

I am sure that is the same problem, sometimes the previous page is not re-painted when we change the display value from 'none' to 'block'

Comment 4

[Cristian Rodriguez (:crdlc)]

Follow up https://bugzilla.mozilla.org/show_bug.cgi?id=827130

Comment 5

[Andrew Overholt [:overholt]]

We discussed this during triage today and since it appears the screen will appear once panning has finished, we can't block on this.

Comment 7

[Michael Vines [:m1] [:evilmachines]]

I /think/ this happens when the finger actually exits the touch area on the left and/or right for a brief moment and this confuses the homescreen.    I can't seem to dup this when being mindof of keeping my finger within the bounds of the surface.

Comment 8

[Andrew Overholt [:overholt]]

Pre-emptively CCing graphics people since this may be a Gecko issue.

Comment 9

[David Flanagan [:djf]]

(In reply to Michael Vines [:m1] [:evilmachines] from comment #7)
> I /think/ this happens when the finger actually exits the touch area on the
> left and/or right for a brief moment and this confuses the homescreen.    I
> can't seem to dup this when being mindof of keeping my finger within the
> bounds of the surface.

My experience is the same as michael's here. To me it doesn't have to do with the speed of the swipe, but with going out of bounds. Or maybe starting out of bounds. I don't know if gecko ever delivers touchcancel events. But if it does, perhaps the panning code needs to listen for it and treat touchcancel the same as touchend.  That's completely a guess, however.

Comment 10

[Cristian Rodriguez (:crdlc)]

My experience is different. All these problems are not reproducible in desktop. Sometimes, when a page is translated offscreen although it defines display as block, then it won't be re-painted and we can see blank pages.

Comment 11

[Milan Sreckovic [:milan] (needinfo for best results)]

Adding Timothy, who was looking at bug 827130.

Comment 12

[Cristian Rodriguez (:crdlc)]

Could you test this patch [1]? I guess that resolves this problem as well

[1] https://bugzilla.mozilla.org/show_bug.cgi?id=827130#c28

Comment 13

[Cristian Rodriguez (:crdlc)]

Sorry, applying these two patches this bug is not reproducible:

https://bugzilla.mozilla.org/show_bug.cgi?id=842218#c12
https://bugzilla.mozilla.org/show_bug.cgi?id=827130#c28

Comment 14

[Cristian Rodriguez (:crdlc)]

I cannot reproduce it after landing bug 842218, can you still reproduce the problem? thanks a lot for your help Ben

Comment 15

[Cristian Rodriguez (:crdlc)]

I cannot reproduce so closing, please re-open if you can reproduce the problem