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Similar to past issues seen in Bug 1005677 & Bug 805303 
Test case: open vlc > any menu item, window will be way too long hortizontally & will hang
Ex. - 
xwininfo -all

xwininfo: Please select the window about which you
          would like information by clicking the
          mouse in that window.

xwininfo: Window id: 0x3a0000f "Open Media"

  Root window id: 0xd4 (the root window) (has no name)
  Parent window id: 0x1016ca3 (has no name)
     0 children.

  Absolute upper-left X:  59
  Absolute upper-left Y:  366
  Relative upper-left X:  0
  Relative upper-left Y:  0
  Width: 16383
  Height: 404
  Depth: 24
  Visual: 0xb1
  Visual Class: TrueColor
  Border width: 0
  Class: InputOutput
  Colormap: 0x3a0000c (not installed)
  Bit Gravity State: ForgetGravity
  Window Gravity State: NorthWestGravity
  Backing Store State: NotUseful
  Save Under State: no
  Map State: IsViewable
  Override Redirect State: no
  Corners:  +59+366  --14522+366  --14522-310  +59-310
  -geometry 16383x404+59+366

  Bit gravity: ForgetGravity
  Window gravity: NorthWestGravity
  Backing-store hint: NotUseful
  Backing-planes to be preserved: 0xffffffff
  Backing pixel: 0
  Save-unders: No

  Someone wants these events:
      KeyPress
      KeyRelease
      ButtonPress
      ButtonRelease
      EnterWindow
      LeaveWindow
      PointerMotion
      ButtonMotion
      Exposure
      StructureNotify
      FocusChange
      PropertyChange
  Do not propagate these events:
  Override redirection?: No

  Window manager hints:
      Client accepts input or input focus: Yes
      Initial state is Normal State
      Displayed on desktop 0
      Window type:
          Dialog
          Normal
      Window state:
          Modal
      Process id: 305
      Frame extents: 0, 0, 28, 0

  Normal window size hints:
      User supplied location: 59, 338
      User supplied size: 524309 by 404
      Program supplied minimum size: 16383 by 404
      Program supplied maximum size: 900 by 16383
      Program supplied window gravity: StaticGravity
  No zoom window size hints defined

  No window shape defined
  No border shape defined

If the overlay-scrollbar packages are removed menu windows open, vlc complains about module not able to be loaded & menus are not as accessible as they should be. 
If vlc is opened with export LIBOVERLAY_SCROLLBAR=0 && vlc then all is well. 
As I understand overlay-scrollbars is not going to be used or something like that, hence yet again starting bug on vlc though other packages like calibre may be affected & or the cause

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: vlc 2.2.1-5
ProcVersionSignature: Ubuntu 4.3.0-2.11-generic 4.3.0
Uname: Linux 4.3.0-2-generic x86_64
ApportVersion: 2.19.3-0ubuntu2
Architecture: amd64
CurrentDesktop: Unity
Date: Wed Jan  6 09:37:07 2016
InstallationDate: Installed on 2015-10-25 (72 days ago)
InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
SourcePackage: vlc
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: overlay-scrollbar (Ubuntu)
     Importance: High
         Status: Invalid

** Affects: qtbase-opensource-src (Ubuntu)
     Importance: High
     Assignee: miRv (mirv)
         Status: Confirmed


** Tags: amd64 apport-bug third-party-packages xenial
-- 
Overlay scrollbars causes menu windows to be vastly oversized & unusable
https://bugs.launchpad.net/bugs/1531516
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