[Bug swing/26354] New: Removing single characters in JTextArea leaves model in broken state

[thebohemian at gmx dot net]

Consider that someone typed this into a JTextArea:

abc
def

Now the caret is placed before the d and delete is pressed. This should remove
the d and the caret should stay where it is.

In Classpath the d is removed correctly but the cursor moves behind the c. The
reason is that the code in PlainDocument.removeUpdate() joins the Element
instances of the first and the second line.

Inside the method is a call to rootElement.getElementIndex(). Given a value of
4 (offset of the d) this should return 1 but instead 0 is returned. For 5 the
correct value of 1 is returned. The combination of the two indices lets the
algorithm think that a line-spanning removal has taken place which in turn
provokes that the elements are joined.

What is odd is that the return values of getElementIndex() are OK when you call
the before the removal is initiated.


-- 
           Summary: Removing single characters in JTextArea leaves model in
                    broken state
           Product: classpath
           Version: 0.21
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: swing
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: thebohemian at gmx dot net


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=26354