[Bug 1641629] [NEW] Autocomplete popups are misplaced

[gpothier]

Public bug reported:

Since Ubuntu 16.10, Firefox misplaces autocomplete popups. In the
attached screenshot, the autocomplete popup is displayed below the
"Nombre transferencia" field, although the focused field is "Mensaje
para destinatario", below. Also, moving the mouse pointer below the
correct field actually highlights completion options as if the menu was
there (see the mouse pointer position on the screenshot)

ProblemType: Bug
DistroRelease: Ubuntu 16.10
Package: firefox 49.0.2+build2-0ubuntu0.16.10.2
ProcVersionSignature: Ubuntu 4.8.0-27.29-generic 4.8.1
Uname: Linux 4.8.0-27-generic x86_64
AddonCompatCheckDisabled: False
ApportVersion: 2.20.3-0ubuntu8
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC1:  gpothier   3169 F.... pulseaudio
 /dev/snd/controlC0:  gpothier   3169 F.... pulseaudio
BuildID: 20161025164528
Channel: Unavailable
CurrentDesktop: GNOME
Date: Mon Nov 14 11:57:19 2016
ForcedLayersAccel: False
IfupdownConfig:
 # interfaces(5) file used by ifup(8) and ifdown(8)
 auto lo
 iface lo inet loopback
IncompatibleExtensions:
 English (South Africa) Language Pack - langpack-en-ZA at firefox.mozilla.org
 English (GB) Language Pack - langpack-en-GB at firefox.mozilla.org
 Default - {972ce4c6-7e08-4474-a285-3208198ce6fd}
InstallationDate: Installed on 2015-01-23 (660 days ago)
InstallationMedia: Ubuntu-GNOME 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
MostRecentCrashID: bp-604f3b87-472e-4026-8588-3d2122160725
PrefSources: prefs.js
Profiles: Profile0 (Default) - LastVersion=49.0.2/20161025164528 (In use)
RelatedPackageVersions:
 google-talkplugin 5.41.0.0-1
 rhythmbox-mozilla 3.4.1-1ubuntu1
 gnome-shell       3.20.4-0ubuntu2
RunningIncompatibleAddons: True
SourcePackage: firefox
SubmittedCrashIDs:
 bp-604f3b87-472e-4026-8588-3d2122160725
 bp-1cd058b7-bfd2-4105-a9b4-1852d2160703
 bp-b5b0d8b4-2b5b-40f5-b468-f5eec2160122
 bp-aba8367f-3da0-4f1c-9342-b377f2151224
UpgradeStatus: Upgraded to yakkety on 2016-10-30 (15 days ago)
dmi.bios.date: 03/30/2015
dmi.bios.vendor: LENOVO
dmi.bios.version: 76CN43WW
dmi.board.asset.tag: No Asset Tag
dmi.board.name: Yoga2
dmi.board.vendor: LENOVO
dmi.board.version: 31900058STD
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo Yoga 2 Pro
dmi.modalias: dmi:bvnLENOVO:bvr76CN43WW:bd03/30/2015:svnLENOVO:pn20266:pvrLenovoYoga2Pro:rvnLENOVO:rnYoga2:rvr31900058STD:cvnLENOVO:ct10:cvrLenovoYoga2Pro:
dmi.product.name: 20266
dmi.product.version: Lenovo Yoga 2 Pro
dmi.sys.vendor: LENOVO

** Affects: firefox (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug yakkety

** Attachment added: "(some information is redacted)"
   https://bugs.launchpad.net/bugs/1641629/+attachment/4777274/+files/20161114_114930.jpg

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https://bugs.launchpad.net/bugs/1641629

Title:
  Autocomplete popups are misplaced

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