RFR: 8303038: Glass gtk3 sends scroll events with delta(x, y) = 0 [v3]

[Thiago Milczarek Sayao]

> Simple fix to get the scroll deltas from GDK_SCROLL_SMOOTH. If we ignore this scroll event type, deltas are sent to java with the value equal to zero.

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

  Fix direction

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Changes:
  - all: https://git.openjdk.org/jfx/pull/1044/files
  - new: https://git.openjdk.org/jfx/pull/1044/files/135f410a..0af8cf6f

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1044&range=02
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1044&range=01-02

  Stats: 13 lines in 1 file changed: 9 ins; 4 del; 0 mod
  Patch: https://git.openjdk.org/jfx/pull/1044.diff
  Fetch: git fetch https://git.openjdk.org/jfx pull/1044/head:pull/1044

PR: https://git.openjdk.org/jfx/pull/1044