Public bug reported:

Something really goofy is going on with SMplayer playing on my Lubuntu
16.04 system.

I will attach some screenshots, but let me first describe the situation
as it is happening right now.

Right now, I had played an audio (.mp3) file, having previously played a
number of video (.mp4) files maximised (I don't know if originally I
told it to maximise, or it just did so, based on the dimensions of the
video).

The box SMPlayer shows, with the controls, is occupying the upper left hand 
side of the screen., but the windowbar extends the full width of the screen.
It is on Desktop #3.

If I go to Desktop #1, where I am writing this bug report in Firefox,
and then switch to Desktop #3, the image of Desktop #1 is visible behind
the SMPlayer box and Playlist box. In addition, when Lubuntu switches
Desktops, it briefly puts up a little box showing the (for me) 4
Desktops as a series of connected squares, one of which is dark colored,
and the rest white, along with the text 'Desktop x', x being the number
of the Desktop.  Anyway, this is usually transient, disappearing within
a quarter of a second or so.  On Desktop #3, this little box has taken
up permanent residence.

If I go to Desktop #2, which is where I have my file manager (Nemo)
window displayed, and then to Desktop #3, Now it is the file manager
window which is behind SMPlayer and Playlist boxes.

If I go to Desktop #4, which is empty except for the desktop, and switch to 
Desktop #3,
now it is the desktop which is behind SMPlayer/Playlist boxes.

I assume that it is incorrect for SMPlayer to draw a small box for audio
file playback, but have the window bar for that small box go across the
whole screen.

What I don't know is who is responsible for window redraw - if it is the App 
that redraws,
or if the App merely reports the dimensions of the window and gadgets etc. to 
the  OS, which then redraws, based on that report, or ... ?

Something is definitely wrong, though...

---------------------------------------------------------

scott@scott-Asus-M2N68-AM-Plus:~$ uname -a
Linux scott-Asus-M2N68-AM-Plus 4.4.0-31-generic #50-Ubuntu SMP Wed Jul 13 
00:06:14 UTC 2016 i686 athlon i686 GNU/Linux
scott@scott-Asus-M2N68-AM-Plus:~$ lsb_release -dsc
Ubuntu 16.04 LTS
xenial
scott@scott-Asus-M2N68-AM-Plus:~$ echo $DESKTOP_SESSION
Lubuntu

scott@scott-Asus-M2N68-AM-Plus:~$ smplayer --version
This is SMPlayer v. 16.7.0 running on Linux

16.7.0-1~xenial1  (from Synaptic)

** Affects: smplayer (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: redraw window

** Attachment added: "SMPlayerOverDesktop1.png"
   
https://bugs.launchpad.net/bugs/1604224/+attachment/4703166/+files/SMPlayerOverDesktop1.png

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https://bugs.launchpad.net/bugs/1604224

Title:
  Window redraw is messed up.

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