Revert "Use translate coordinates request to find parent window; more efficient than query tree"
Revert "Use translate coordinates request to find parent window; more efficient than query tree"

This reverts commit bb6dd3c3a1685c30a22e3038fad27fc823c025bf.

This was a bad idea. Returns the wrong children for windows in the same
position (through stacking).

jotrk/x-choyce,jotrk/x-choyce