I have the taskbar set to "Never group", so icons of multiple instances of the same program always appear directly next to each other. This set of icons always fills in the very order the instances are launched, i.e. if I open Notepad three times, the instance opened first is always the left icon, the second one the middle icon, the last one the right icon.
However, when an application seems to do heavy duty (for example Visual Studio loading a large solution), that instance's icon sometimes, seemingly randomly, gets positioned at the right side as if it were a new instance, even if it has been the very first one all the time.
This is highly irritating when you're working with those multiple instances and are used to their order, and sometimes you just end up in the wrong instances when clicking one of the icons - because one got put at the back of the list.
Does anyone know what's causing this? Is there a setting to prevent this from happening while keeping the "Never group" setup?