How to reproduce:
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Try and replace 'toString()' by 'clone()' in the code below, in Column mode

• start from this code
  Foo foo = new Foo ();
  Object a = foo.toString ();
  Object b = foo.toString ();
  Object c = foo.toString ();

• enable ColumnMode
• select the block of 'toString(), on 3 rows
• type 'c'
• type Ctrl-Space

=>

Foo foo = new Foo ();
Object a = foo.c (); <<------- PROBLEM
Object b = foo.c (); <<------- PROBLEM
Object c = foo.clone ();