<Swing Dev> code review request: 7049024: DnD fails with JTextArea and JTextField

[Sean Chou]

Hi all,

    The case is about how to handle system selection when
DefaultCaret.moveDot is invoked.
In current implementation, the text component (like JTextField) related to
the DefaultCaret
instance will change the system selection because caret moves (as perform a
"select"
operation). However, there is an action in DnD that only the view needs to
be restored in a
selected status while the system selection should not be restored because it
is not a
"select" operation.

    The fix checks if the component related to the DefaultCaret instance
owns the focus,
if it does, the action is treated as user selection and update "system
selection"; else, the
action is thought to restore the visual status of the component only and
does not update
"system selection".

    And, there is a regression testcase in the patch as well. The testcase
is put in directory
JTextArea because the bug is reported to it.

    Webrev is here : http://cr.openjdk.java.net/~ngmr/7049024/webrev.02/

    I have tested it on linux.
    Windows is not affected by this bug and the regression test case does
not affect it as well.

-- 
Best Regards,
Sean Chou
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