Blame: "Ignore all whitespaces" Diff option behaves as "Ignore whitespace changes"

While implementing the Blame Diff options in Version Insight I've
noticed an issue with the Blame Diff options in version 1.7.4. I don't
know if this is regression. I've noticed it actually with 1.7.2 and it
is still there after updating to 1.7.4.

Steps:
1. create a new text file with a few lines and a single character in
each line (*1)
2. add + commit
3. add a space in front of a line (*2)
4. commit
5. add another space in front of the line modified in step 3. (*3)
6. commit
7. call blame with the Diff options
     [x] Ignore line endings
     (*) Ignore all whitespaces
8. check blame output

expected: all lines have the revision from step 2.
actual:
- all lines, but the line modified in step 3. and 5. have the revision
from step 2.
- the line modified in step 3. and 5. has the revision from step 4.

The actual result seems to be the same as using the option "Ignore
whitespace changes" and is similar to the SVN command line
"svn blame -x-b <file>". With the SVN command line "svn blame -x-w
<file>" or svn_diff_file_ignore_space_all in my implementation the
result is as expected.

*1
1
2
3
4
5

*2
1
2
   3
4
5

*3
1
2
    3
4
5

--
Uwe Schuster
http://sourceforge.net/projects/radstudioverins/
http://www.bitcommander.de/blog
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