Kdevelop doesn't quit after use of plugin

[darvark]

Hi,
I'm developing new plugin for KDevelop - scratchpad plugin requested as 
bug 176389. And I stuck with strange behavior. When I use my plugin, and 
after that I decide to close application main window disappear, but 
process doesn't end. Still in process tree I can find leftovers of 
closed app. But when I simply open kdevelop, and close it, without using 
plugin this error doesn't occur. Source code of this plugin you can find 
https://github.com/darvark/kdevplatform/plugins/scratchpad. Does anyone 
met similar problem with any KDE app?

Below output of ps axuf and console

114 darvark 983  0.0  0.2 323404 24268 ?        Ss   15:53   0:00 
kdeinit4: kdeinit4 Running...
     115 darvark    984  0.0  0.2 331116 16696 ?        S 15:53   0:04  
\_ kdeinit4: klauncher [kdeinit] --fd=9
     116 darvark   1010  0.0  0.2 506276 23904 ?        Sl 15:53   0:00  
\_ kdeinit4: ksmserver [kdeinit]
     117 darvark   1065  0.3  0.8 2840628 66156 ?       Sl 15:53   0:46  
|   \_ kwin -session 10d2eccc6e000140921935800000008860000_1412274585_1993
     118 darvark   1115  0.0  0.1 404072 15540 ?        Sl 15:53   0:00  
\_ kdeinit4: nepomukserver [kdeinit]
     119 darvark   1119  1.9  0.4 1327024 38704 ?       SNl 15:53   
4:20  |   \_ /usr/bin/nepomukservicestub nepomukstorage
     120 darvark   1332 59.0  1.0 545264 85728 ?        SNl 15:54 
130:11  |   |   \_ /usr/bin/virtuoso-t +foreground +configfile 
/tmp/virtuoso_fB1119.ini +wa    120 it
     121 darvark   1337  1.3  0.3 465464 29040 ?        SNl 15:54   
3:05  |   \_ /usr/bin/nepomukservicestub nepomukfileindexer
     122 darvark   1340  0.3  0.4 467564 35020 ?        SNl 15:54   
0:42  |   \_ /usr/bin/nepomukservicestub nepomukfilewatch
     123 darvark   1187  0.0  0.3 481076 27020 ?        Sl 15:54   0:01  
\_ /usr/bin/pidgin --session 10d2eccc6e000141201200100000011160065 
--display :0
     124 darvark   1277  0.0  0.6 514428 51504 ?        Ss 15:54   0:00  
\_ python /usr/bin/hp-systray -x
     125 darvark   1297  0.2  0.1 154980 13124 ?        S 15:54   0:29  
|   \_ python /usr/bin/hp-systray -x
     126 darvark   1298  0.0  0.1 126312 10892 ?        S 15:54   0:00  
|       \_ python /usr/bin/hp-systray -x
     127 darvark   1278  0.0  0.3 373204 28184 ?        Sl 15:54   0:00  
\_ /usr/bin/python /usr/bin/blueman-applet
     128 darvark   1352  0.1  0.2 230444 19776 ?        S 15:58   0:14  
\_ /usr/bin/xchat
     129 darvark  13841  1.0  0.1 326676 13960 ?        S 19:34   0:00  
\_ kdeinit4: kio_man [kdeinit] man 
local:/tmp/ksocket-darvark/klauncherXMT984.slave    129 -socket 
local:/tmp/ksocket-darvark/kdevelopb13786.slave-socket
     130 darvark  13842  0.1  0.2 410728 16680 ?        Sl 19:34   0:00  
\_ kdeinit4: kio_trash [kdeinit] trash 
local:/tmp/ksocket-darvark/klauncherXMT984.s    130 lave-socket 
local:/tmp/ksocket-darvark/kdevelopY13786.slave-socket
     131 darvark  13843  0.0  0.1 334456 15488 ?        S 19:34   0:00  
\_ kdeinit4: kio_file [kdeinit] file 
local:/tmp/ksocket-darvark/klauncherXMT984.sla    131 ve-socket 
local:/tmp/ksocket-darvark/kdevelopB13786.slave-socket
     132 darvark  13848  0.0  0.1 334456 15452 ?        S 19:34   0:00  
\_ kdeinit4: kio_file [kdeinit] file 
local:/tmp/ksocket-darvark/klauncherXMT984.sla    132 ve-socket 
local:/tmp/ksocket-darvark/kdevelopF13786.slave-socket
     133 darvark  14109  0.0  0.1 334456 15436 ?        S 19:34   0:00  
\_ kdeinit4: kio_file [kdeinit] file 
local:/tmp/ksocket-darvark/klauncherXMT984.sla    133 ve-socket 
local:/tmp/ksocket-darvark/lancelotTP1132.slave-socket
     134 darvark    986  0.1  0.5 1105924 42548 ?       Sl 15:53   0:13 
kdeinit4: kded4 [kdeinit]


and in console I have

QIODevice::setTextModeEnabled: The device is not open
QIODevice::setTextModeEnabled: The device is not open
in scratchpadexecute
X Error: BadWindow (invalid Window parameter) 3
   Major opcode: 20 (X_GetProperty)
   Resource id:  0x600018d
file does not exists
QFSFileEngine::open: No file name specified
wrong
X Error: BadWindow (invalid Window parameter) 3
   Major opcode: 20 (X_GetProperty)
   Resource id:  0x60001aa
kdevelop(13786)/kdevdefinesandincludes CompilerProvider::projectClosed: 
Removed project:  "KDevelop"
kdevelop(13786)/kdevdefinesandincludes CompilerProvider::projectClosed: 
Removed project: "kdevplatform"
X Error: BadWindow (invalid Window parameter) 3
   Major opcode: 20 (X_GetProperty)
   Resource id:  0x6000020


Br,
Marcin
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