Start using multimap correctly for path tracking in RojoTree

src/snapshot/metadata.rs

@@ -17,18 +17,6 @@ pub struct InstanceMetadata {
     pub source: Option<InstanceSource>,
 }
 
-#[derive(Debug, Clone, PartialEq)]
-pub enum InstanceSource {
-    File {
-        path: PathBuf,
-    },
-    ProjectFile {
-        path: PathBuf,
-        name: String,
-        node: ProjectNode,
-    },
-}
-
 impl Default for InstanceMetadata {
     fn default() -> Self {
         InstanceMetadata {
@@ -37,3 +25,9 @@ impl Default for InstanceMetadata {
         }
     }
 }
+
+#[derive(Debug, Clone, PartialEq)]
+pub struct InstanceSource {
+    pub path: PathBuf,
+    pub project_node: Option<(String, ProjectNode)>,
+}