Collection entries of unequal types are reordered in plugin configuration
-------------------------------------------------------------------------

                 Key: MNG-3852
                 URL: http://jira.codehaus.org/browse/MNG-3852
             Project: Maven 2
          Issue Type: Bug
          Components: POM
    Affects Versions: 3.0-alpha-1
            Reporter: Espen Wiborg


It seems that the modelproperty sorting is a bit overzealous.  Configure e.g. 
the exec-maven-plugin thusly:


{code:xml}
<plugin>
  <groupId>org.codehaus.mojo</groupId>
  <artifactId>exec-maven-plugin</artifactId>
  <configuration>
    <executable>echo</executable>
    <arguments>
      <argument>foo</argument>
      <classpath/>
      <argument>bar</argument>
    </arguments>
  </configuration>
</plugin>
{code}

With Maven 2.0.9 I get the expected output

{noformat}
[INFO] [exec:exec]
[INFO] foo /home/espenhw/tmp/target/classes bar
{noformat}

While with 3.0-SNAPSHOT I get

{noformat}
[INFO] [exec:exec]
[INFO] foo bar /home/espenhw/tmp/target/classes
{noformat}

This breaks the common use case of 

{code:xml}
<plugin>
  <groupId>org.codehaus.mojo</groupId>
  <artifactId>exec-maven-plugin</artifactId>
  <configuration>
    <executable>java</executable>
    <arguments>
      <argument>-cp</argument>
      <classpath/>
      <argument>my.app.MainClass</argument>
    </arguments>
  </configuration>
</plugin>
{code}


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