The matching-brace action should work when the cursor is before or 
after an open or close brace. The four examples are:

|{           }
 {|          }
 {          |}
 {           }|

where the '|' indicates the cursor location.

If their is ambiguity then the bracket following the cursor should be given 
preference.

For example:
1 2          
{|{          }               }

In the above case the bracket under 2 should be give a preference.