SUMMARY
On SLES11 SP4 system running KDE 4.3.5 window icons for applications based on Qt 5.9.1 appear on the taskbar for all desktops even though both "Only show tasks from the current desktop" and "Only show tasks from the current screen" are selected in the Task Manager Settings.

This does not occur with a RedHat 6 system running KDE 4.3.4 running the same Qt 5.9.1 based application.

Note that in both cases KDE is running in a VNC server.  On the SuSE system I noticed that when remote displaying to the VNC session from another display, the problem did not occur.  I compared the environment variables from both terminal session and noted that the VNC terminal session defined VNCDESKTOP with a value of "X".  If I "unsetenv VNCDESKTOP" (I'm using csh) and start the application then the problem no longer occurs and the window icons only show in the taskbar of the same desktop they are in.  Doing "setenv VNCDESKTOP X" restored the wrong behavior.

This is a critical issue because our software is being blamed for this by our customers, even though we do not set anything that I can determine would cause this.  Note that thie problem does not occur on RedHat Linux, only on SuSE Linux (SLES).  Also, note that unsetting an environment variable that I assume should have no effect on how taskbar icons are displayed changes how they are displayed.

STEPS TO REPRODUCE
1. 
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OBSERVED RESULT


EXPECTED RESULT


SOFTWARE/OS VERSIONS
Linux/KDE Plasma: SLES 11 SP4
(available in About System)
KDE Plasma Version: 4.3.5
KDE Frameworks Version: 
Qt Version: 5.9.1

ADDITIONAL INFORMATION