4459231: Focus of JTabbedPane(with Scrollable tablayout) changes on change in LookAndFeel

[prsadhuk]

On changing LookAndFeel of JTabbedPane, it resets the focus of the child tabs to starting child tab.
That is, if a JTabbedPane has say 10 tabs and we select the 10th tab and then we change the L&F, the focus is shifted to Tab0 even though the selected tab is still at 10th tab.

This is because when we switch L&F, installUI will reset the focusIndex

jdk/src/java.desktop/share/classes/javax/swing/plaf/basic/BasicTabbedPaneUI.java

Lines 285 to 290 in 3481252

	public void installUI(JComponent c) {
	this.tabPane = (JTabbedPane)c;
	calculatedBaseline = false;
	rolloverTabIndex = -1;
	focusIndex = -1;

which needs to set the proper focus by calling scrollRectToVisible to selected tab which is done in this fix.

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• JDK-4459231: Focus of JTabbedPane(with Scrollable tablayout) changes on change in LookAndFeel (Bug - P4)

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