find supported mime types of an appinfo
@matthiasc
Submitted by Matthias Clasen Link to original bug (#585982)
Description
In nautilus, when you click on an office document like a .pptx file and don't have office apps installed, you get a file-roller window, which is really not helpful. This happens because all those office formats are subclass-of zip.
To make nautilus behave better there, it would be necessary to find out if the appinfo returned by g_app_info_get_default_for_type actually supports the type in question or just a supertype.
One way to do that would be to add a
const char **g_app_info_get_supported_content_types (GAppInfo *appinfo)