This extension represents all opened windows as Icons. Its strength lies in the ability to handle multiple monitors, workspaces and window-settings. Also this extension is able to handle multiple docklets with various settings at the same time. It is meant to be very flexible and highly customizable. Since there are countless combinations of settings, it is pretty hard to test if all combinations behave as expected or in a way that is preferred. So if you encounter any problems or have any suggestions, please don't hesitate to contact me. I admit, that I am sometimes lazy in responding to emails but I always read them :) My email is in the About-section in the preferences - you can also just comment here.

Extension Homepage

https://extensions.gnome.org/extension/105/panel-docklet/