[cp-patches] Fixing the selection handling in JTextComponent.

[Meskauskas Audrius]

The Mauve test have indicated wrong work of the 
JTextComponent.getSelectedText(). For example, if the text is 0123456789 and 
the selection covers the interval 2..5, the expected value is '234' and the 
returned value is '01234'.

Another test indicated that setSelectionStart(int) and setSelectionEnd(int) 
can set the 'dot' of the component carret ahead the 'mark' of this carret, 
something that should never happen unless moveCaretPosition(int) is called. 
This clearly shows that goes wrong in the first test.

Fixing this problem required to rewrite several selection-related methods in 
JTextComponent. The suggested path is attached. With this path, the 
selection handling seems operating as expected.

This case is covered by the two tests, 
gnu.testlet.javax.swing.JTextArea.text and additionally written 
gnu.testlet.javax.swing.JTextArea gettingText.

As this file uses tabulation symbol, the whitespace may not be correctly 
displayed in the patch. Please verify the attached java file before 
reporting the wrongly placed whitespace.

Audrius Meskauskas.

JTextComponent.java
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JTextComponent.java.diff
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