I have Windows 8, but I'm sure I saw this option in windows 7 before. I set the Taskbar to combine only when full.
But it seems to me that Windows is once in a while moving the position of the windows within an application on the taskbar. If I try to drag one individual button(icon) for a window of an app on the taskbar, all the buttons(icons) for the windows of that app drag. So I see no way to manually re-arrange.
Am I imagining things or is windows occasionally moving the windows around within the application on the taskbar? This confuses me as I don't know which icon represents which window.
How can I prevent this behaviour so that they are all in fixed positions?