Now, mark commands with region on headers view,
target of the first email is reflected in the rest of email.
```
Date From Subject
--------------------------------------------
2012-12-05 Github ...
2012-12-05 Yahoo! ...
2012-12-05 Work ...
refiling to
Date From Subject
--------------------------------------------
r -> /github 2012-12-05 Github ...
r -> /github 2012-12-05 Yahoo! ...
r -> /github 2012-12-05 Work ...
```
In this patch, change target in region email.
```
Date From Subject
--------------------------------------------
r -> /github 2012-12-05 Github ...
r -> /yahoo 2012-12-05 Yahoo! ...
r -> /work 2012-12-05 Work ...
```
522f4104f9