RFR: 8155030: The Menu Mnemonics are always displayed for GTK LAF [v2]

[Alisen Chung]

On Wed, 8 May 2024 05:53:38 GMT, Abhishek Kumar <abhiscxk at openjdk.org> wrote:

>> In GTK LAF, the menu mnemonics are always displayed which is different from the native behavior. In native application **(tested with gedit**), the menu mnemonics toggle on press of `ALT` key. Menu mnemonics are hidden initially and then toggles between show/hide on `ALT` press. 
>> Proposed fix is to handle the `ALT` key press for GTK LAF and mimic the native behavior. Fix is similar to the `ALT` key processing in  Windows LAF. Automated test case is added to verify the fix and tested in Ubuntu and Oracle linux.
>> 
>> CI testing is green and link attached in JBS.
>
> Abhishek Kumar has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Var moved to local scope

src/java.desktop/share/classes/javax/swing/plaf/synth/SynthLookAndFeel.java line 1085:

> 1083:         if (UIManager.getBoolean("Button.showMnemonics")) {
> 1084:             // Do not hide mnemonics if the UI defaults do not support this
> 1085:             isMnemonicHidden = false;

why does the get method also set the `isMnemonicHidden` flag? Shouldn't this only be done on the set method?

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PR Review Comment: https://git.openjdk.org/jdk/pull/18992#discussion_r1595973841