Allow source and target based validation for the focus transfer between two JComponents

Currently class javax.swing.InputVerifier supports the source based validation only. It is worth to add the focus target based validation to support some extended scenarios.


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The javax.swing.InputVerifier class now extended to support the source+target based input focus transferring validation with the release of JDK 9. A new javax.swing.InputVerifier#verifyTarget() method is added, the javax.swing.InputVerifier#shouldYieldFocus() method is overloaded to accept both Swing components participating in focus transfer operation, its old version is now deprecated and does not used by Swing.
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