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[Filip Stanek <1196177@xxxxxxxxxxxxxxxxxx>]

I can confirm, that this bug is still present on LTS version 14.04.3 with all.
Can someone please use the fix from Saucy for Trusty?

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https://bugs.launchpad.net/bugs/1196177

Title:
  Gnome-Panel White Square (Gnome-Fallback-Session/Flashback)

Status in Compiz:
  Invalid
Status in GNOME Panel:
  Fix Released
Status in Ubuntu theme:
  Invalid
Status in gnome-panel package in Ubuntu:
  Fix Released
Status in ubuntu-themes package in Ubuntu:
  Invalid

Bug description:
  Description:
  White squares appears in blank sections of gnome panel at Ubuntu Startup and during window Minimize / Maximize Actions. Gnome-Flashback with Compiz (Effects) only.

  Distribution:

  Ubuntu Saucy Salamander (development branch)
  Release:	13.10

  Packages:

  compiz:
    Installed: 1:0.9.9~daily13.04.18.1~13.04-0ubuntu1
    Candidate: 1:0.9.9~daily13.04.18.1~13.04-0ubuntu1
    Version table:
   *** 1:0.9.9~daily13.04.18.1~13.04-0ubuntu1 0
          500 http://archive.ubuntu.com/ubuntu/ saucy/main amd64 Packages
          100 /var/lib/dpkg/status

  gnome-session-fallback formerly gnome-session-flashback in ubuntu 13.10:
    Installed: 1:3.6.2-0ubuntu11
    Candidate: 1:3.6.2-0ubuntu11
    Version table:
   *** 1:3.6.2-0ubuntu11 0
          500 http://archive.ubuntu.com/ubuntu/ saucy/universe amd64 Packages
          100 /var/lib/dpkg/status

  How to Reproduce:

  Normally after distro-upgrade or a clean install, since the 1st Boot
  you'll see a white square in unussed portion of gnome panels (totally
  white if the panel is clean)

  Steps:

  1.- Launch some application (firefox in this case)
  2.- Left Mouse Click on Firefo's Window List Box (This Will Minimize Firefox to Panel)
  3.- At this Step, maybe the White panell has disappeared ( Now the color is normal according to Ambiance Theme )
  4.- Click Again in Firefox's Windows List Box ( The Window must Maximize and the White Square in Gnome Panel appears Again. If its not, repeat the Minimize and Maximize actios to rise up the bug)

  Temporary WorkArround:

  Enable "Show Hide Buttons" under Panel Properties. This will
  "transfer" the buggy white color effect to the sidebuttons in the
  panel.

  How to Reproduce with Adwaita theme:
  1) Open file for edit:
  /usr/share/themes/Adwaita/gtk-3.0/gtk.css

  2) Add these lines end of file:
  .gnome-panel-menu-bar,
  PanelApplet > GtkMenuBar.menubar,
  PanelToplevel,
  PanelWidget,
  PanelAppletFrame,
  PanelApplet {
      background-image: -gtk-gradient(linear, left top, left bottom, from(shade(#3c3b37, 1.5)), to(shade(#3c3b37, 1.05)));
  }

  3. Switch gtk theme to Adwaita. If already using it, restart gnome-
  panel.

  4. gnome-panel has black background instead of gradient. menu bar and
  indicator applet complete looks like it should.

  5. Opening panel properties and switching background from none to
  solid color and back will bring gradient to whole panel.

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