TextEntry hight and multiline not working, gtk3 backend

[ibilon]

I'm trying to display a TextEntry with multiple lines but it doesn't work and also stays at the default size.

I tried the sample code from https://github.com/mono/xwt/blob/master/TestApps/Samples/Samples/TextEntries.cs
(my entire file https://gist.github.com/ibilon/bc2a49c6160e29dae1e3884189e3019e)

I'm on linux, compiled with mcs /reference:Xwt.dll Test.cs,
mono version is 4.2.0 and gtk 3.5.4
and using latest git of xwt (f981e41)

This is the result I get:

[ibilon]

Seems to work on windows/wpf:

[sevoku]

Related/Dup: #375