Dash - Add Dash group header mouseover effect

This is to highlight the fact that the whole header is clickable, and can reveal more results in particular.

Fixed in Unity 2D when the new dash design was introduced.

This bug was fixed in the package unity - 3.6.8-0ubuntu1

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unity (3.6.8-0ubuntu1) natty; urgency=low

  * New upstream release.
    - crash at the second drag and drop from an unity place (LP: #736704)
    - Compiz crashes with SIGSEGV in nux::GraphicsDisplay::GrabPointer when
      opening the Dash (LP: #737287)
    - Visual Tearing/Rendering Issues with Unity Launcher (LP: #737476)
    - unity-window-decorator crash on unity panel dragout (LP: #740480)
    - unity-panel-service crashed with SIGSEGV in g_type_check_instance_is_a()
      (LP: #694699)
    - compiz crashed with SIGSEGV in nux::BaseTexture::GetDeviceTexture()
      (LP: #692823)
    - the "no result" and "search the web" items need icons (LP: #711199)
    - Resizing with external padding/grab area prevents reaching edge of
      screen (LP: #710356)
    - drag and drop of launcher icons uses microscopic drag icon (LP: #727647)
    - text in places look squeezed (LP: #727799)
    - at-spi-registry consumes most of the CPU and make the system unusable on
      Natty (LP: #729827)
    - migrate_favorites.py crashed with GError in __main__: Bad key or
      directory name: "/desktop/unity/launcher/favorites/app-
      dc++.desktop/type": `+' is an invalid character in key/directory names
      (LP: #737016)
    - Launcher hide state is confusing (LP: #739850)
    - Polish new launcher hide state (part 2) (LP: #740020)
    - launcher icons should expan on super or when entering keynav
      (LP: #741319)
    - Launcher - Dragging a Launcher icon to the Trash should remove the icon
      (LP: #676466)
    - Launcher - Enable dragging and dropping of files & folders to Launcher
      icons (LP: #676549)
    - Dash - Add Dash group header mouseover effect (LP: #689640)
    - unity aborts when you plug in an external monitor (LP: #700757)
    - Keyboard-navigation: focus on launcher remembered (LP: #713340)
    - Launcher Quicklists should always contain the application title
      (LP: #723877)
    - When a maximized window has window on top of it in 'restored state' (not
      maximised) , it is not possible to un-maximized the window by dragging
      the title bar downwards (LP: #723882)
    - When windows open for the first time they should not hide the launcher
      (LP: #723878)
    - UI blocked when expanding a section with more than 2000 items
      (LP: #736059)
    - Change ALT-Tab to bring the target window to the front (LP: #736938)
    - compiz crashed with SIGABRT in __kernel_vsyscall() (LP: #737814)
    - Launcher does not respond to changes in icon theme (LP: #605475)
    - Implement new style scrollbars in Dash (LP: #608124)
    - Closing launcher menu raises window under mouse (LP: #728787)
    - adding url launcher support from the search (LP: #739038)
    - Launcher - Set Launcher 'Hide Animation' to 'Slide only' by default.
      Also introduce subtle fade in effect. (LP: #739567)
    - "Time & Date" settings appears in launcher with empty tooltip
      (LP: #740907)
    - ZeitgeistLog missing implementation of get_property for "connected"
      (LP: #734080)
    - often can't alt-click-dnd to move the focussed dialog (LP: #711911)
    - The Unity P...