Bug 338748

I had several windows open and decided to close them all. After closing several of them, I tried to close my Pidgin chat session using the X button in the top right (which I had attached Buddy List as a tab to), but the Pidgin window still stayed open even after 'ps aux | grep -i pidgin' showed that Pidgin exited.

Even if I switch activities, the Pidgin window is still visible. However, clicks go straight through the window, triggering events on whatever is behind the ghostly Pidgin window even if I'm clicking on the window decorations, not the content of the window.

The Alt+Tab window list doesn't show the window.

As a sort-of workaround, turning off compositing with Alt+Shift+F12 makes the Pidgin window disappear and it stays gone if I turn compositing back on.

Reproducible: Didn't try

Steps to Reproduce:
1. Open Pidgin
2. Start a chat
3. Focus the Pidgin chat window
4. Window menu->Attach as tab to Buddy List
5. Window menu->Activities->All Activities
6. Close Pidgin by clicking the X on the top right

Actual Results:  
Pidgin window cannot be closed or focused even though 'ps aux | grep -i pidgin' shows that Pidgin has already exited. Clicking on the Pidgin window will launch the desktop icon behind it. xwininfo reports the window id of the dead Pidgin window as "plasma-desktop"

If I switch activities, the Pidgin window switches too, but still can't be clicked or interacted with in any way, though clicking in the Pidgin window will affect the window (or desktop icon) below Pidgin.

Expected Results:  
Pidgin's window should have disappeared when Pidgin completely exited.

I have compositing enabled with the following effects enabled from Configure Desktop->Desktop Effects in addition to the default enabled effects:

   Invert, Enabled Zoom, Translucency, Wobbly Windows, and Desktop Cube.

Under General Translucency Settings, I've set all sliders to the third tick counting from the right.
Under Window Behavior, Focus stealing prevention is set to High.

Graphics information:
OpenGL vendor string: NVIDIA Corporation
OpenGL renderer string: GeForce GT 220/PCIe/SSE2
OpenGL core profile version string: 3.3.0 NVIDIA 304.121
OpenGL core profile shading language version string: 3.30 NVIDIA via Cg compiler

Versions:
Qt: 4.8.6
KDE Development Platform: 4.13.3
KWin: 4.11.11
X.Org X Server 1.14.3.901 (1.14.4 RC 1) (Release Date: 2013-10-26)
OS: Linux 3.11.10-21-desktop #1 SMP PREEMPT Mon Jul 21 15:28:46 UTC 2014 (9a9565d) x86_64 x86_64 x86_64 GNU/Linux
Pidgin 2.10.9 (libpurple 2.10.9)
KWin RPM: kwin-4.11.11-115.3.x86_64
Pidgin RPM: pidgin-2.10.9-4.18.1.x86_64
Xorg RPM: xorg-x11-server-7.6_1.14.3.901-8.1.x86_64

KWin gives me a warning about disabled triple buffering in ~/.xsession-errors-:0
> kwin(16595) KWin::GlxBackend::present: 
> It seems you are using the nvidia driver without triple buffering
> You must export __GL_YIELD="USLEEP" to prevent large CPU overhead on synced swaps
> Preferably, enable the TripleBuffer Option in the xorg.conf Device
> For this reason, the tearing prevention has been disabled.
> See https://bugs.kde.org/show_bug.cgi?id=322060

NVidia related RPMS:
> rpm -qa | fgrep -i 304.121
nvidia-gfxG02-kmp-desktop-304.121_k3.11.6_4-36.1.x86_64
nvidia-gfxG02-kmp-desktop-304.121_k3.11.6_4-31.1.x86_64
nvidia-gfxG02-kmp-desktop-304.121_k3.11.6_4-37.1.x86_64
nvidia-computeG02-304.121-38.1.x86_64
x11-video-nvidiaG02-304.121-38.1.x86_64