cocoa: fix for TCocoaComboBox not getting LCL object target (was there a reason?). added a note about incorrect implementation of GetPreferredSize - to be resolved

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@47178 4005530d-fff6-0310-9dd1-cebe43e6787f
cocoa: correct wrong variable checked on the CococaWSComboBox create

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@47179 4005530d-fff6-0310-9dd1-cebe43e6787f