Use the proper index sets and so on to make deleting work from the sidebar again. Fix #192.

Evergreen/MainWindow/Sidebar/SidebarViewController.swift

@@ -111,14 +111,17 @@ import RSCore
             return
         }
         
-		let selectedRows = outlineView.selectedRowIndexes
-
 		animatingChanges = true
 		outlineView.beginUpdates()
-		outlineView.removeItems(at: selectedRows, inParent: nil, withAnimation: [.slideDown])
-		outlineView.endUpdates()
 
-        runCommand(deleteCommand)
+		let indexSetsGroupedByParent = Node.indexSetsGroupedByParent(nodesToDelete)
+		for (parent, indexSet) in indexSetsGroupedByParent {
+			outlineView.removeItems(at: indexSet, inParent: parent.isRoot ? nil : parent, withAnimation: [.slideDown])
+		}
+
+		outlineView.endUpdates()
+		
+		runCommand(deleteCommand)
 		animatingChanges = false
 	}
 
@@ -465,6 +468,22 @@ private extension SidebarViewController {
 			deleteItemForNode(oneNode)
 		}
 	}
-	
+
+	func commonParentItemForNodes(_ nodes: [Node]) -> Node? {
+
+		if nodes.isEmpty {
+			return nil
+		}
+
+		guard let parent = nodes.first!.parent else {
+			return nil
+		}
+		for node in nodes {
+			if node.parent !== parent {
+				return nil
+			}
+		}
+		return parent
+	}
 }
 

Frameworks/RSTree/RSTree/Node.swift

@@ -8,14 +8,17 @@
 
 import Foundation
 
-public final class Node: Equatable {
+public final class Node: Hashable {
 	
 	public weak var parent: Node?
 	public let representedObject: AnyObject
 	public var canHaveChildNodes = false
 	public var isGroupItem = false
 	public var childNodes: [Node]?
-	
+	public let hashValue: Int
+	private static var incrementingID = 0
+	private static var incrementingIDLock = NSLock()
+
 	public var isRoot: Bool {
 		get {
 			if let _ = parent {
@@ -63,6 +66,11 @@ public final class Node: Equatable {
 		
 		self.representedObject = representedObject
 		self.parent = parent
+
+		Node.incrementingIDLock.lock()
+		self.hashValue = Node.incrementingID
+		Node.incrementingID += 1
+		Node.incrementingIDLock.unlock()
 	}
 	
 	public class func genericRootNode() -> Node {
@@ -137,6 +145,35 @@ public final class Node: Equatable {
 			nomad = parent
 		}
 	}
+
+	public class func nodesOrganizedByParent(_ nodes: [Node]) -> [Node: [Node]] {
+
+		let nodesWithParents = nodes.filter { $0.parent != nil }
+		return Dictionary(grouping: nodesWithParents, by: { $0.parent! })
+	}
+
+	public class func indexSetsGroupedByParent(_ nodes: [Node]) -> [Node: IndexSet] {
+
+		let d = nodesOrganizedByParent(nodes)
+		let indexSetDictionary = d.mapValues { (nodes) -> IndexSet in
+
+			var indexSet = IndexSet()
+			if nodes.isEmpty {
+				return indexSet
+			}
+
+			let parent = nodes.first!.parent!
+			for node in nodes {
+				if let index = parent.indexOfChild(node) {
+					indexSet.insert(index)
+				}
+			}
+
+			return indexSet
+		}
+
+		return indexSetDictionary
+	}
 }