RFR: 8367045: [Linux] Dead keys not working [v3]

[Thiago Milczarek Sayao]

> The bug report is on Linux Mint which does not use ibus (the gnome default).
> 
> With this change, it continues to work on ibus, but also works works without it (on mint).
> 
> Tested with fcitx too.

Thiago Milczarek Sayao has updated the pull request incrementally with one additional commit since the last revision:

  setting IBUS_ENABLE_SYNC_MODE seems to be not required with the other changes

-------------

Changes:
  - all: https://git.openjdk.org/jfx/pull/1922/files
  - new: https://git.openjdk.org/jfx/pull/1922/files/d72196c4..15935c15

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1922&range=02
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1922&range=01-02

  Stats: 3 lines in 1 file changed: 0 ins; 3 del; 0 mod
  Patch: https://git.openjdk.org/jfx/pull/1922.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1922/head:pull/1922

PR: https://git.openjdk.org/jfx/pull/1922