RFR: 8155030: The Menu Mnemonics are always displayed for GTK LAF [v4]

[Alisen Chung]

On Fri, 24 May 2024 06:29:23 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:
> 
>   condition check update

src/java.desktop/share/classes/javax/swing/plaf/synth/SynthGraphicsUtils.java line 769:

> 767:      */
> 768:     static void repaintMnemonicsInContainer(final Container cont) {
> 769:         for (int i = 0; i < cont.getComponentCount(); i++) {

i think you can use `final Component c : cont.getComponents()` here the same way you did in the repaintMnemonicsInWindow method

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PR Review Comment: https://git.openjdk.org/jdk/pull/18992#discussion_r1621372299