Scrolling in the Email app has no inertial scrolling with the latest gecko revision. This is a regression in Gecko. This affects all parts of the email app, including scrolling through folders. This doesn't seem to effect any other gaia app. Details: 1) APZ + HWC is enabled. 2) Gaia Rev - 2162b4a, v1.3 b1e8602 - Occurs on both. Good Gecko Rev: changeset: 164407:d8f0dc811109 tag: tip user: Richard Newman <rnewman@mozilla.com> date: Tue Jan 21 08:23:43 2014 -0800 summary: No bug: the OVERRIDE HOOK is stupid. Bad Gecko Rev: changeset: 164725:cad591993bfa tag: tip parent: 164702:66bd9fa91eff parent: 164724:385ed622a7da user: Ryan VanderMeulen <ryanvm@gmail.com> date: Wed Jan 22 15:32:22 2014 -0500 summary: Merge fx-team to m-c.

Doug might be able to help with this.

Started bisecting. Thanks for the contact @gal. Doug, if you have any thoughts on what changed in the past day, I'd appreciate it. Thanks!

Just finished bisecting, the bad commit is: changeset: 164587:28f8657d36e9 user: Benoit Girard <bgirard@mozilla.com> date: Tue Jan 21 12:33:52 2014 -0500 summary: Bug 950488 - Overhaul APZ handling of overflow:hidden. r=botond Benwa: Is it possible to change a few email CSS properties or do we need to back the change out? Thanks!

I've traced the problem to here: http://mxr.mozilla.org/mozilla-central/source/gfx/layers/ipc/Axis.cpp#140 I'm not sure yet why we're getting axis locked on a regular scrollable frame. Looking more into it.

I've traced it further to here: http://mxr.mozilla.org/mozilla-central/source/gfx/layers/ipc/Axis.cpp#145 And then to here: http://mxr.mozilla.org/mozilla-central/source/layout/base/nsDisplayList.cpp#625 It seems that the scrollbar styles are being misreported, or something like that. Here's the relevant code in Gaia: https://github.com/mozilla-b2g/gaia/blob/9fba58cd97022041dd804961c8587a8f45950e63/apps/email/style/message_cards.css#L9 Commenting out this line fixes the issue O.o

(In reply to Mason Chang [:mchang] from comment #4) > Just finished bisecting, the bad commit is: > > changeset: 164587:28f8657d36e9 > user: Benoit Girard <bgirard@mozilla.com> > date: Tue Jan 21 12:33:52 2014 -0500 > summary: Bug 950488 - Overhaul APZ handling of overflow:hidden. r=botond > > > Benwa: Is it possible to change a few email CSS properties or do we need to > back the change out? Thanks! There is a bug in this patch: on this line [1], we are passing a flag that pertains to the x axis, to a function that deals with the y axis. In this case the element is overflow-x:hidden, and this is preventing the y axis from scrolling. [1] http://mxr.mozilla.org/mozilla-central/source/gfx/layers/ipc/AsyncPanZoomController.cpp#1231

Actually assigning back to mchang since he did all the heavy lifting here :)

Patch is in my outgoing queue but tree is closed.

This will need uplifting to aurora as well.

(In reply to Ryan VanderMeulen [:RyanVM UTC-5] from comment #15) > https://hg.mozilla.org/releases/mozilla-aurora/rev/573b19cdae30 Thanks for uplifting this and the previous bug Ryan :)

kevin, is this something you could verify or pass on to someone who's set up for FirefoxOS testing? Thanks!