RFR: 6875229: Wrong placement of icons in JTabbedPane in Nimbus

[Jayathirth D V]

On Wed, 21 Jun 2023 15:36:14 GMT, Prasanta Sadhukhan <psadhukhan at openjdk.org> wrote:

> Icon is placed after text in JTabbedPane for NimbusL&F since the text is drawn at LEADING position instead of TRAILING as is done for [other L&F](https://github.com/openjdk/jdk/blob/59c6c0e1b7148a7139f5e6a4ba2b19623c20c77d/src/java.desktop/share/classes/javax/swing/plaf/basic/BasicTabbedPaneUI.java#L1155-L1160)
> 
> Before fix
> ![image](https://github.com/openjdk/jdk/assets/43534309/10d3f919-46e0-47e9-9d27-b33e49b2d62c)
> 
> After fix
> ![image](https://github.com/openjdk/jdk/assets/43534309/0c4906ec-df2a-4ce6-8399-fd1cd9e34450)

Change looks good to me, except for a small query i have.
Test runs fine with & without fix.

test/jdk/javax/swing/plaf/nimbus/TestNimbusTabbedPaneIconPosition.java line 54:

> 52:     static volatile Rectangle bounds;
> 53:     private static void addTab(JTabbedPane aTabbedPane, int anIndex) {
> 54:         aTabbedPane.addTab("\u2588", new Icon() {

First time i saw usage of Full block character for title and it took some time for me to understand this, unique way to find difference and read color.

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PR Review: https://git.openjdk.org/jdk/pull/14596#pullrequestreview-1512696121
PR Review Comment: https://git.openjdk.org/jdk/pull/14596#discussion_r1251907312