Job property editor wrongly adds trailing spaces to variable names

Current Situation 

• SourceForge user report:
  • When defining Environment Variables from Workflow variables the Name and Value fields have drop down options. Name works fine, but if you use drop down option for the value field (NOTE: not the automatic prefill with tab) the space is added at the end of the value variable. I.e. Name: MY_VAR; Value: $my_var ;

Desired Behavior

• No trailing space should be added by the job property editor.
• If an expression is used that does not end with a single quote or double quote then the job property editor should remove any leading and trailing spaces.