RFR: 8308644: [Linux] Missing mappings for dead keys + Alt Gr [v5]

[Martin Fox]

On Thu, 22 Jun 2023 11:45:30 GMT, Thiago Milczarek Sayao <tsayao at openjdk.org> wrote:

>> This PR adds missing key mappings for dead keys and fixes "Alt Gr" for some systems.
>
> Thiago Milczarek Sayao has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains 16 additional commits since the last revision:
> 
>  - Minimize changes
>  - Merge branch 'master' into gdk_to_glass_key_map
>  - Forgot test code
>  - Back to hash
>  - Revert key lock change because it has different behaviour
>  - Revert modifier change + Remove F13 -> F24
>  - Remove print statement
>  - Use GDK instead of X calls (to ease in a future wayland implementation)
>  - Avoid sending unknown key event
>  - GDK_META_MASK is not ALT
>  - ... and 6 more: https://git.openjdk.org/jfx/compare/97b01884...aad021a6

My apologies, I have been reviewing this but didn't get around to writing up my comments.

Currently JavaFX assumes that AltGr will be reported as Alt_R. On ISO keyboards (including U.K. English) AltGr is reported as ISO_Level3_Shift. On these keyboards ISO_Level3_Shift is also the only keyval that works if we want to target AltGr using a Robot. Just adding a second entry to the table isn't sufficient to fix that, currently the Robot will only attempt one code and at the moment it's Alt_R. I'll add AltGr to the KeyboardTest app, make sure ISO_Level3_Shift is in the table, and update the Robot code as part of fixing [JDK-8278924](https://bugs.openjdk.org/browse/JDK-8278924).

I do want the dead key changes in at some point. There's no reason for us to misidentify keys when the changes are this easy and adding them to the table will enable testing of dead key handling using a Robot.

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PR Comment: https://git.openjdk.org/jfx/pull/1143#issuecomment-1868061121