Selecting Tab 1.1 Brings Tab 1 from Another Window to Foreground

I noticed the following behavior:
When I have a window with Tab 1 open in the taskbar and select a tab numbered 1.1, it actualy dosn't matter if it is 1.1 or 1.2 or any other 1.x tab,  in a different window, Tab 1 in the other window is automatically brought to the foreground, regardless of which tab was previously active there. 
Is this intendet behavior or is this a bug?


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