Martin Kočí created MYFACES-3791:
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             Summary: [perf] reuse _SelectItemsIterator in 
UISelectOne.validateValue
                 Key: MYFACES-3791
                 URL: https://issues.apache.org/jira/browse/MYFACES-3791
             Project: MyFaces Core
          Issue Type: Improvement
         Environment: myfaces core trunk
            Reporter: Martin Kočí
            Priority: Minor



Current  implementation of UISelectOne.validateValue creates (when 
component.requred = true) two instances of _SelectItemsIterator, iterates  2x  
and evaluates ValueExpression for SelectItem(s) 2x.

We can create one instance of SelectItemsIterator and store the 
noSelectionOption direct in the _SelectItemsIterator instance and reuse in 
noSelectionOption-block.

Similar issue MYFACES-3710.

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