RFR: 8226990: GTK & Nimbus LAF: Tabbed pane's background color is not expected one when change the opaque checkbox. [v9]

[Harshitha Onkar]

On Thu, 18 Apr 2024 04:47:15 GMT, Abhishek Kumar <abhiscxk at openjdk.org> wrote:

>> JTabbedPane's content area, tab area and tab background color are not as expected when opaque is set to true or false. 
>> The proposed fix is to handle the TabbedPane's background color in installed LAFs. Manual test is added to support the fix and there is no regression caused by the fix. 
>> 
>> Proposed fix is tested in Ubuntu 22.04 and Oracle linux.
>> 
>> CI link is posted in JBS.
>
> Abhishek Kumar has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Number of tab increased

test/jdk/javax/swing/JTabbedPane/TestJTabbedPaneOpaqueColor.java line 83:

> 81:               - Select the 'content opaque' and check that content area is opaque
> 82:                 (it must be gray).
> 83:             Check this behaviour for other LAFs and tab layout.

@kumarabhi006 Click to check box 'content opaque' might seem unclear, whether the checkbox needs to be checked or unchecked. It is better to replace it with phrases - "checked/unchecked" or "select/unselect" as below.

Same applies to Case 1 and Case 3.


Test Case 2 - Test Content pane opacity:
To test Content pane opacity, make sure "Opaque checkbox" is UNCHECKED.

Verify the following with 'content opaque' option:
- when checked: the content area should be opaque (it must be gray).
- when unchecked: the content area should be transparent (it must be green).
           
Check this behavior for other LAFs and tab layout.

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PR Review Comment: https://git.openjdk.org/jdk/pull/17720#discussion_r1571572910