/usr/share/doc/xfwm4-themes/TODO is in xfwm4-themes 4.10.0-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | Things to do
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Add your favorite wish list here :
* Multiscreen mode (not Xinerama)
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