LCL: Publish events OnMouseWheel, OnMouseWheelDown and OnMouseWheelUp for more controls. Issue #26781, patch from Sandro Cumerlato.

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@46336 4005530d-fff6-0310-9dd1-cebe43e6787f
IdeIntf, Object Inspector: fix ComponentTreeHeight and code using it. ComponentPanel.Height was assigned to itself. Issue #26788.

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@46337 4005530d-fff6-0310-9dd1-cebe43e6787f