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[Daniel Hahler <launchpad@xxxxxxxxxx>]

I've noticed this also, but it appears to be more prominent for me (with
Gtk3 apps).

E.g., with gtk3-widget-factory there will be no background.

** Attachment added: "Screenshot"
   https://bugs.launchpad.net/ubuntu/+source/overlay-scrollbar/+bug/1436120/+attachment/4398528/+files/gtk3-widget-factory_066.png

** Changed in: overlay-scrollbar (Ubuntu)
       Status: New => Triaged

** Changed in: overlay-scrollbar (Ubuntu)
   Importance: Undecided => Medium

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https://bugs.launchpad.net/bugs/1436120

Title:
   Faulty transparency in Gtk+ "About" dialog due to overlay scrollbar

Status in overlay-scrollbar package in Ubuntu:
  Triaged

Bug description:
  Open the Help->About dialog of a Gtk+ app, e.g. gnome-terminal, gedit,
  evince...

  Some text appears over the default gray background.  Click on the
  Credits or License button.  New text appears on white.  Now click on
  this button again to close the info that just appeared.

  Expected behivior:  The initial look of the About dialog should be
  restored.

  Actual behavior:  The foreground text is there, but the background
  becomes black (Utopic) or transparent (Vivid beta).

  If the dialog is closed and opened again, it'll be faulty right away
  for the rest of the app's lifetime.  You have to restart the
  application to make it show correctly again.

  Tested both with Gnome-shell and Unity; and both with Adwaita and
  Ambiance.  In case of gnome-terminal, both with and without the
  unofficial transparency patch.

  LIBOVERLAY_SCROLLBAR=0 makes the bug go away.

  In https://bugzilla.gnome.org/show_bug.cgi?id=746707 mainsteam Gtk+
  developer stated that he (presumably on Fedora) can't see the bug
  either, and his (apparently correct) guess was that it's caused by the
  overlay scrollbar.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: overlay-scrollbar-gtk3 0.2.16+r359+15.04.20150319-0ubuntu1
  ProcVersionSignature: Ubuntu 3.19.0-10.10-generic 3.19.2
  Uname: Linux 3.19.0-10-generic x86_64
  ApportVersion: 2.16.2-0ubuntu4
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Wed Mar 25 01:34:25 2015
  InstallationDate: Installed on 2012-05-30 (1028 days ago)
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
  SourcePackage: overlay-scrollbar
  UpgradeStatus: Upgraded to vivid on 2015-03-17 (7 days ago)

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