- changing 'case' to 'ecase' in function 'clear'   this way user get a runtime error if pass an invalid keyword value   as  'target'   arguments  instead   of  unexpected   behaviour  when   refreshing a window.
- changing 'case' to 'ecase' in function 'clear'
  this way user get a runtime error if pass an invalid keyword value
  as  'target'   arguments  instead   of  unexpected   behaviour  when
  refreshing a window.

McParen/croatoan