Comment on attachment 8915954
Bug 143038 Make users can scroll contents horizontally with vertical wheel 
operation with a modifier

https://reviewboard.mozilla.org/r/186794/#review195394

> You change the ordering of whether action is first checked for plugin
or apz, and delta is adjusted before the plugin chcek. But I guess that
makes sense. But please test (manually) some Flash doing scrolling.

It's necessary to adjust the wheel deltas before updating wheel
transaction which is automatically done in ComputeScrollTarget().

And unfortunately, I don't find Flash contents which have horizontal
scroll. As far as I read Action Script documents, Action Script doesn't
support horizontal wheel events. Therefore, Flash contents cannot handle
horizontal scroll anyway. I don't know about the scrollable contents in
Flash. That's what I could find.

> We do have this similar code in several places.
> Can you think of anyway to have a helper method to do this all? If not, fine.

Okay, I did it in new patch.

> Vertually? Do you mean Virtually

Oops! Nice catch!

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https://bugs.launchpad.net/bugs/1228250

Title:
  [Shift + Mouse-Scroll-Wheel] Does NOT Scroll Horizontally

Status in Mozilla Firefox:
  Fix Released
Status in firefox package in Ubuntu:
  Fix Released

Bug description:
  In Chromium, I can scroll horizontally using my mouse-wheel by holding
  down the shift key while scrolling the mouse wheel.

  Firefox is missing this very convenient page-navigation short-cut.

  
  Use Case:

  As my eyes age, I find myself always scaling up the web pages I read
  (by holding down crtl and scrolling my mouse wheel).

  Doing this, often makes the page exceed the width of my monitor
  (hiding the right-side of the text I want to read) and produces a
  horizontal scroll bar at the bottom of the page.

  At this point, since I've already used ctrl-scroll-mouse-wheel to
  magnify the page, it would be wonderful if I could use shift-scroll-
  mouse-wheel to horizontally-scroll the magnified page and therefore
  center the (previously cropped) text that I am wanting to read.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: firefox 24.0+build1-0ubuntu0.13.04.1
  ProcVersionSignature: Ubuntu 3.8.0-30.44-generic 3.8.13.6
  Uname: Linux 3.8.0-30-generic x86_64
  NonfreeKernelModules: wl
  AddonCompatCheckDisabled: False
  ApportVersion: 2.9.2-0ubuntu8.3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  lonnie     2161 F.... pulseaudio
   /dev/snd/pcmC0D0p:   lonnie     2161 F...m pulseaudio
  BrokenPermissions: sessionstore.bak (0o600, wrong owner)
  BuildID: 20130911155223
  Channel: Unavailable
  Date: Fri Sep 20 11:02:07 2013
  ForcedLayersAccel: False
  IfupdownConfig:
   # interfaces(5) file used by ifup(8) and ifdown(8)
   auto lo
   iface lo inet loopback
  InstallationDate: Installed on 2013-09-06 (14 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  IpRoute:
   default via 192.168.24.1 dev eth0  proto static 
   192.168.24.0/24 dev eth0  proto kernel  scope link  src 192.168.24.198  
metric 1
  MarkForUpload: True
  PrefSources:
   prefs.js
   
[Profile]/extensions/{b9db16a4-6edc-47ec-a1f4-b86292ed211d}/defaults/preferences/prefs-dwhelper.js
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  Profiles: Profile0 (Default) - LastVersion=24.0/20130911155223 (In use)
  RelatedPackageVersions:
   google-talkplugin 4.5.3.0-1
   icedtea-7-plugin  1.3.2-1ubuntu1.1
   totem-mozilla     3.6.3-0ubuntu6
   rhythmbox-mozilla 2.98-0ubuntu5
  RunningIncompatibleAddons: False
  SourcePackage: firefox
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 04/14/2011
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A09
  dmi.board.name: 0P792H
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A09
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: A09
  dmi.modalias: 
dmi:bvnDellInc.:bvrA09:bd04/14/2011:svnDellInc.:pnStudio1737:pvrA09:rvnDellInc.:rn0P792H:rvrA09:cvnDellInc.:ct8:cvrA09:
  dmi.product.name: Studio 1737
  dmi.product.version: A09
  dmi.sys.vendor: Dell Inc.

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