Clicking in the area just below the main sound output control slider in the gnome-control-center will make it make a test sound with the current sound level though will not change it

[Wise Melon]

I have recently noticed that in the gnome-control-center if one is to click anywhere in this area (the area with the black box around it): Sound.png

It will emit a test sound with the current level of the sound (so it emits it at the same sound level you have set, but not the level you are clicking just below of), though it will not change the sound level of the slider position. Of course doing this on the actual slider makes it adjust to the level of sound you are clicking on on the scale and emit its test sound from its new volume, and the same when click above (not on) the slider, though below, as I said before, seems not to change where the slider is located, not the current volume level, all it does is emits the test sound.

In my opinion though it should only be doing any of this when one drags or clicks on the actual slider, not above, nor below, even if above is behaving more correctly than below.

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OS Information:

    No LSB modules are available.
    Distributor ID: Ubuntu
    Description: Ubuntu 15.10
    Release: 15.10
    Codename: wily
    Flavour: GNOME
    GNOME Version: 3.18

Package Information:

    gnome-control-center:
      Installed: 1:3.18.2-1ubuntu1~wily1
      Candidate: 1:3.18.2-1ubuntu1~wily1
      Version table:
     *** 1:3.18.2-1ubuntu1~wily1 0
            500 http://ppa.launchpad.net/gnome3-team/gnome3-staging/ubuntu/ wily/main amd64 Packages
            100 /var/lib/dpkg/status
         1:3.16.3-0ubuntu1 0
            500 http://archive.ubuntu.com/ubuntu/ wily/universe amd64 Packages
         1:3.16.2-2ubuntu1~wily5 0
            500 http://ppa.launchpad.net/gnome3-team/gnome3/ubuntu/ wily/main amd64 Packages