D22160: Document tree view close on middle button

[Tristan Porteries]

tristanp added a reviewer: KDevelop.

REPOSITORY
  R32 KDevelop

REVISION DETAIL
  https://phabricator.kde.org/D22160

To: tristanp, #kdevelop
Cc: kdevelop-devel, hmitonneau, christiant, glebaccon, domson, antismap, iodelay, alexeymin, geetamc, Pilzschaf, akshaydeo, surgenight, arrowd
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