The action that clicking a title bar with the second mouse button (mouse wheel) can't be changed or deactivated. I find this annoying because I use wheel click to close tabs and if I fail the windows goes completely out of focus (behind all others windows). Thank you.
A simple patch for making it optional: https://github.com/CBke/xfwm4/commit/e34e71e06f0bdadee45e5fde4af7c5f51e7dc358
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