InfoBar action-area's horizontal orientation tag is not saved
Submitted by Jean-François Fortin Tam
Created attachment 234133 sample gtkbuilder file
The attached gtk builder file contains a GtkInfoBar called "warning_infobar". If you set its internal action_area's orientation to Vertical, it gets saved, however if you set it to horizontal, it does not get written to the resulting .ui file.
The result is that applications that try to use this glade file through gobject introspection will never know about the orientation, so it will always show up with a vertical button arrangement.
I don't know if this is the only widget affected, and the only property affected...
Attachment 234133, "sample gtkbuilder file":