Merge branch 'uisim-xtest'

Make wxUIActionSimulator work with GTK+3, including when using DPI scaling.

docs/changes.txt

@@ -88,6 +88,7 @@ All (GUI):
 
 wxGTK:
 
+- Make wxUIActionSimulator work with GTK+ 3 (Scott Talbert).
 - Implement setting link colours in wxHyperlinkCtrl for GTK+3 (Hanmac).
 - Support background colour in wxDataViewCtrl attributes.
 - Improve wxSpinCtrl best size calculation.

docs/doxygen/mainpages/const_wxusedef.h

@@ -267,6 +267,7 @@ library:
 @itemdef{wxUSE_LIBSDL, Use SDL for wxSound implementation.}
 @itemdef{wxUSE_PLUGINS, See also wxUSE_LIBSDL.}
 @itemdef{wxUSE_UNIX, Enabled on Unix Platform.}
+@itemdef(wxUSE_XTEST, Use XTest extension.}
 @endDefList