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Description of problem:
When having multiple windows of the same type open (say xterm or konsole) and having KDE group them by type in the task bar, if you have more than 20 grouped, clicking on the taskbar button loads the list invisibly.  I cannot see the list of windows for that type but if I click where the list should be it opens a window.  Grouped list is invisible on the screen, I cannot see the list.

Version-Release number of selected component (if applicable):
kdeplasma-addons-4.10.5-5.el7.x86_64

How reproducible:
Always

Steps to Reproduce:
1. On RHEL7.2, login into kde session and open more that 20 windows of konsole.
It will be grouped in one list.
2. Minimize all windows and click on grouped window to see the list.

Actual results:
I cannot see the list of windows for that type, but if I click where the list should be it opens a window.

Expected results:
I should be able to see the list of windows.

Additional info:
If I change the widget style from "System Settings -> Style -> Applications -> Widget Style" and click on grouped window list it shows the list correctly, only one time. But after that the same issue reappears.

I have no update on this, but reading your description it looks it won't be hard to fix this.

Fixed in kde-workspace-4.11.19-10.el7.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2018:0717