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From the source (epan/dissectors/packet-tcp.c):

     * Remember if we have already seen at least one ACK,
     * then we can neutralize the Window Scale side-effect at the beginning (issue 14690)

14690: First "TCP window full" not detected

I haven't seen anything to reuse in the conversations, so I suggest adding a boolean which will track the first ACK (see my merge request). In such rare case where the Window is full before a first ACK, this will neutralize this side-effect of window scaling which is not expected here. However the analysis is good and the GUI gives the right Calculated window size.

1450: TCP: First Full TCP Window is not detected