e1b8ed8dd4e83c16d5baddd6e9f9c0a8b6a7afb7
ED_screen_duplicate() was never written to support non-fullscreen modes.
This is prior to the hidden ui fullscreen commit, and it's quite ancient
in Blender's code (since Jan/08 - 1363134d)
That's why duplicate window, and new screen operators are disabled when
screen is full.
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