Philip Withnall 937c6f15cd gfileinfo: Document required attributes for helper getters
It doesn’t make sense to (for example) call `g_file_info_get_name()` if
the `GFileInfo` doesn’t contain `G_FILE_ATTRIBUTE_STANDARD_NAME`, given
that building the `GFileInfo` is typically a static process and entirely
under the control of the programmer.

By being this restrictive, we avoid having to return ‘unknown’ values
for some of these standard APIs, particularly the numeric ones such as
`g_file_info_get_size()`. If APIs like that were to work correctly in
the face of a `GFileInfo` without `G_FILE_ATTRIBUTE_STANDARD_SIZE`
specified, they’d have to be able to return a value to indicate the
attribute is missing. Returning `0` or `G_MAXSIZE` to indicate that
would be ambiguous.

Signed-off-by: Philip Withnall <pwithnall@endlessos.org>

Fixes: #2907
2023-02-08 09:54:54 +00:00
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