Fix #1816: Select file after drop is finished.

ILSpy/MainWindow.xaml.cs

@@ -742,6 +742,8 @@ namespace ICSharpCode.ILSpy
 		public ILSpyTreeNode FindTreeNode(object reference)
 		{
 			switch (reference) {
+				case LoadedAssembly lasm:
+					return assemblyListTreeNode.FindAssemblyNode(lasm);
 				case PEFile asm:
 					return assemblyListTreeNode.FindAssemblyNode(asm);
 				case Resource res:

ILSpy/TreeNodes/AssemblyListTreeNode.cs

@@ -116,6 +116,8 @@ namespace ICSharpCode.ILSpy.TreeNodes
 					foreach (LoadedAssembly asm in assemblies) {
 						assemblyList.assemblies.Insert(index, asm);
 					}
+					var nodes = assemblies.SelectArray(MainWindow.Instance.FindTreeNode);
+					MainWindow.Instance.SelectNodes(nodes);
 				}
 			}
 		}