Selected text is not highligthed in Grid Cell element on GTK3 (Linux) builds.

[HelioGuilherme66]

Operating system: Fedora Core 26
wxPython version: 4.0.0rc1
Stock or custom build: Custom Build GTK2 and GTK3 here
Python version: 2.7.14 and 3.6.2
Stock or custom build: Stock

Description of the problem:
Selected text at GridCell is not highlighted on GTK3 build.
To reproduce run the demo GridCustEditor.py (or GridSimple.py) and double-click a cell containing text (or select text in edit mode). The text is not highlighted on GTK3, but it is OK on GTK2.
Images taken with Python3 and GTK2 vs Python2 and GTK3:

With GTK2:

With GTK3:

[RobinD42]

It seems to be working fine here...

[HelioGuilherme66]

Strange.
You think it is because I am using KDE on Fedora?

[swt2c]

It's not KDE. I also see it on Fedora, but with Gnome Shell.

[swt2c]

This is another wxWidgets issue. I can reproduce it with the grid sample.

[swt2c]

Filed https://trac.wxwidgets.org/ticket/18005

[swt2c]

Fixed upstream.