Commits on Jul 26, 2023

1. [designspace] Deserialize lib fields …

   This was about as painful as expected, and requires us to manually glue
   together the xml data model with the plist model, using serde.
   
   To briefly summarize the problem: XML data, by definition, does not have
   any defined semantics. Semantics are added on top of XML on a per-case
   basis, by indicating the document type inline
   (<https://en.wikipedia.org/wiki/Document_type_declaration>).
   
   The plist crate does implement derive for plist types, but they are based on the
   assumption that type information is being provided by some deserializer
   (e.g. for a specific file format). This is the right thing for the plist
   crate to do. Unfortunately quick_xml cannot provide this type
   information, since quick_xml does not know that we are deserializing a
   plist.
   
   To make this all work, I have added a bunch of manual deserialize code.
   This code will only work when deserializing from XML; if in the future
   we wish to serialize to other formats, we will need to revise it.
   
   Some notes:
   
   - This only implements deserialization, not serialization. (This is
     fine, since we do not currently serialize anyway, but we'll have to
     figure that out eventually)
   - this does not support the UID type, which is not accepted in XML
     plists

   

   cmyr committed Jul 26, 2023
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