RFR: 8348095: [Linux] Menu shows up in wrong position when using i3 windows manager in full screen mode [v2]

[Thiago Milczarek Sayao]

> The issue was with the view's position, specifically the content's X and Y coordinates relative to the window, including its decorations. When in fullscreen mode, the window remains decorated, but the decorations are hidden. As a result, the content's position needs to be recalculated to account for the window's adjusted layout.
> 
> It's not specific to i3.
> 
> I used `gdk_window_get_root_origin`   because GTK will try harder to find the value, even if `_NET_FRAME_EXTENTS` is not supported on some Window Manager.

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

  Clarify the meaning of view_x and view_y.

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Changes:
  - all: https://git.openjdk.org/jfx/pull/1702/files
  - new: https://git.openjdk.org/jfx/pull/1702/files/b3443aef..ac68cfb3

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jfx&pr=1702&range=01
 - incr: https://webrevs.openjdk.org/?repo=jfx&pr=1702&range=00-01

  Stats: 3 lines in 1 file changed: 3 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jfx/pull/1702.diff
  Fetch: git fetch https://git.openjdk.org/jfx.git pull/1702/head:pull/1702

PR: https://git.openjdk.org/jfx/pull/1702