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The X-Flatpak-RenamedFrom key is used in .desktop files to identify past names for the desktop file. It is defined to be a list of strings. However, there was previously no correct way to retrieve a list of strings from the GKeyFile wrapped by GDesktopAppInfo, short of re-parsing the file with GKeyFile. Note that doing something like: g_strsplit (g_desktop_app_info_get_string (...), ";", -1) is not correct: the raw value "a\;b;" represents the one-element list ["a;b"], but g_key_file_get_string() rejects the sequence "\;", and so g_desktop_app_info_get_string() returns NULL in this case. (Of course, a .desktop file with a semicolon in its name is a pathological case.) Add g_desktop_app_info_get_string_list(), a trivial wrapper around g_key_file_get_string_list(), similar to g_desktop_app_info_get_string() and co. The change from g_key_file_free() to g_key_file_unref() in the test is needed because g_key_file_free() clears the contents of the keyfile...
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