draft additional property observation fix

Author: chloe-yeo

Sources/FoundationEssentials/ProgressManager/ProgressManager+Properties+Accessors.swift

@@ -541,15 +541,17 @@ extension ProgressManager {
     /// - Parameter property: The `TotalFileCount` property type.
     /// - Returns: The sum of all total file counts across the entire progress subtree.
     public func summary(of property: ProgressManager.Properties.TotalFileCount.Type) -> Int {
-        return getUpdatedFileCount(type: .total)
+//        return getUpdatedFileCount(type: .total)
+        return totalFileCount
     }
 
     /// Returns the completed file count across the progress subtree.
     ///
     /// - Parameter property: The `CompletedFileCount` property type.
     /// - Returns: The sum of all completed file counts across the entire progress subtree.
     public func summary(of property: ProgressManager.Properties.CompletedFileCount.Type) -> Int {
-        return getUpdatedFileCount(type: .completed)
+//        return getUpdatedFileCount(type: .completed)
+        return completedFileCount
     }
 
     /// Returns the total byte count across the progress subtree.

Sources/FoundationEssentials/ProgressManager/ProgressManager.swift

@@ -185,6 +185,17 @@ internal import _FoundationCollections
         }
     }
 
+    //MARK: Internal vars to make additional properties observable
+    internal var totalFileCount: Int {
+        _$observationRegistrar.access(self, keyPath: \.totalFileCount)
+        return getUpdatedFileCount(type: .total)
+    }
+    
+    internal var completedFileCount: Int {
+        _$observationRegistrar.access(self, keyPath: \.completedFileCount)
+        return getUpdatedFileCount(type: .completed)
+    }
+    
     //MARK: Fractional Properties Methods
     internal func getProgressFraction() -> ProgressFraction {
         return state.withLock { state in