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wifi: shift BA window when sequence is next to the window end

Alexander Krotov requested to merge alx.k/ns-3-dev:wifi-blockack-outside-window into master

According to the 802.11-2016 standard, 10.24.7.8, the originator may send the packet with SN > WinStart + WinSize – 1 and the recipient should move the window forward.

If SN is equal to WinStart + WinSize == WinEnd + 1, delta is equal to 0, and window is not moved.

This commit makes recipient shift the window in this case.

Edited by Alexander Krotov

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