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No, you definitely do not get a NEWSIZE message if you only move the window. You only get NEWSIZE if you change the window size.

Surely you get IDCMP_CHANGEWINDOW when you programmatically change the window size/position (i.e. MoveWindow(), SizeWindow() or ChangeWindowBox()). And I would accept IDCMP_NEWSIZE from SizeWindow() and ChangeWindowBox(), even if the window's size did not change. But not from MoveWindow().