[kde] [Bug 406166] New: taskbar icons always show on all desktops for Qt5.9.1 based application windows

[Pete Zakel]

https://bugs.kde.org/show_bug.cgi?id=406166

            Bug ID: 406166
           Summary: taskbar icons always show on all desktops for Qt5.9.1
                    based application windows
           Product: kde
           Version: unspecified
          Platform: OpenBSD Packages
                OS: Linux
            Status: REPORTED
          Severity: critical
          Priority: NOR
         Component: general
          Assignee: unassigned-bugs at kde.org
          Reporter: phz at cadence.com
  Target Milestone: ---

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. 
2. 
3. 

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

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