As far as I can tell now, this issue has a relation to the compositor:
- it occurs when selected rendering backend OpenGl 3.1, interface EGL
- it occurs when selected rendering backend OpenGl 2.0, interface EGL

- it does not occur when selected interface GLX
- it does not occur when selected XRender

As it may be OpenGl related, it will be useful to know that that this is
on Intel Haswell:

# kwin_x11 --replace&                                                           
                                                                                
                                       
ferry@chromium:~$ QXcbConnection: XCB error: 8 (BadMatch), sequence: 1434, 
resource id: 27262982, major code: 42 (SetInputFocus), minor code: 0            
                                     
OpenGL vendor string:                   Intel Open Source Technology Center     
                                                                                
                                
OpenGL renderer string:                 Mesa DRI Intel(R) Haswell Mobile        
                                                                                
                                
OpenGL version string:                  3.0 Mesa 11.0.2                         
                                                                                
                                
OpenGL shading language version string: 1.30                                    
                                                                                
                                
Driver:                                 Intel                                   
                                                                                
                                
GPU class:                              Haswell                                 
                                                                                
                                
OpenGL version:                         3.0                                     
                                                                                
                                
GLSL version:                           1.30                                    
                                                                                
                                
Mesa version:                           11.0.2                                  
                                                                                
                                
X server version:                       1.17.2                                  
                                                                                
                                
Linux kernel version:                   4.3                                     
                                                                                
                                
Requires strict binding:                yes                                     
                                                                                
                                
GLSL shaders:                           yes                                     
                                                                                
                                
Texture NPOT support:                   yes                                     
                                                                                
                                
Virtual Machine:                        no

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https://bugs.launchpad.net/bugs/1509434

Title:
  Kubuntu panel, starter, desktop do not redraw on change

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