RFR: 8155030: The Menu Mnemonics are always displayed for GTK LAF [v8]

[Abhishek Kumar]

On Tue, 25 Jun 2024 15:47:49 GMT, Alexey Ivanov <aivanov at openjdk.org> wrote:

>> Abhishek Kumar has updated the pull request incrementally with one additional commit since the last revision:
>> 
>>   Remove access modifier from method declaration
>
> Changes requested by aivanov (Reviewer).

@aivanov-jdk Updated the implementation for mnemonic handler separately inside `sun.swing` package and installed the listener specific to GTK LookAndFeel only.
Mnemonic handler class is responsible for tracking the mnemonics show/hide status and repainting the components.

Changes are reverted back for `SynthLookAndFeel` and `SynthRootPaneUI` files.

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PR Comment: https://git.openjdk.org/jdk/pull/18992#issuecomment-2194302062