[Mono-bugs] [Bug 601101] New: GroupBy excludes groups with a null key if they are the last grouping

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http://bugzilla.novell.com/show_bug.cgi?id=601101

http://bugzilla.novell.com/show_bug.cgi?id=601101#c0


           Summary: GroupBy excludes groups with a null key if they are
                    the last grouping
    Classification: Mono
           Product: Mono: Class Libraries
           Version: SVN
          Platform: Macintosh
        OS/Version: Mac OS X 10.6
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: Sys.Core
        AssignedTo: jbevain at novell.com
        ReportedBy: richard.kiene at logos.com
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---
           Blocker: ---


Created an attachment (id=357920)
 --> (http://bugzilla.novell.com/attachment.cgi?id=357920)
Test application showing the group by bug

User-Agent:       Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10_6_3; en-US)
AppleWebKit/533.2 (KHTML, like Gecko) Chrome/5.0.342.9 Safari/533.2

If you have the following list:

                List<Data> listValues = new List<Data>();

                listValues.Add(new Data(0, "a"));
                listValues.Add(new Data(1, "a"));
                listValues.Add(new Data(2, "b"));
                listValues.Add(new Data(3, "b"));
                listValues.Add(new Data(4, null));

there should be three groups returned when doing a group by on the second item
in the Data pair. However only two groups are returned. 

This is not the case if null is not the last group in the collection.

Reproducible: Always

Steps to Reproduce:
1. Create an IEnumerable collection of pairs with at least one null value in a
pairs value which will be the group by key 
2. Make sure the pair with the null value group by key is the last new key in
the collection
3. Group by this key
Actual Results:  
Non-null groups are returned, but null group is not returned

Expected Results:  
All groups, regardless of the key being null, should be returned

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