MacOS – Prevent switching workspaces when clicking on dock icon

I am constantly running multiple applications on multiple workspaces. I want to remain on the same workspace, and only switch workspaces when I explicitly ask for it (e.g. with a magic mouse gesture).

Currently when I click on the app icon in the dock, osx switches to the next workspace that has a window of the active application.

I know there is an option in System Preferences -> Misson Control, called "When switching to an application, switch to a space with open windows for the application". What it does: When clicking on the icon of an inactive application, don't switch to a workspace that has the application window. But this option does not affect the behaviour of clicking on an active application.

The question: How do I prevent OSX from ever switching to another wokspace when clicking on an app icon in the dock, regardless of whether the app is active of inactive?