Save/Load view extension size and location

src/DynamoCore/Configuration/PreferenceSettings.cs

@@ -370,6 +370,11 @@ public string DefaultPythonEngine
         [XmlIgnore]
         public bool NamespacesToExcludeFromLibrarySpecified { get; set; }
 
+        /// <summary>
+        /// Settings that apply to view extensions.
+        /// </summary>
+        public List<ViewExtensionSettings> ViewExtensionSettings { get; set; }
+
         #endregion
 
         /// <summary>
@@ -415,6 +420,7 @@ public PreferenceSettings()
             ShowTabsAndSpacesInScriptEditor = false;
             EnableNodeAutoComplete = false;
             DefaultPythonEngine = string.Empty;
+            ViewExtensionSettings = new List<ViewExtensionSettings>();
         }
 
         /// <summary>

src/DynamoCore/Configuration/ViewExtensionSettings.cs

@@ -0,0 +1,86 @@
+namespace Dynamo.Configuration
+{
+    /// <summary>
+    /// Settings that apply to a view extension specifically.
+    /// </summary>
+    public class ViewExtensionSettings
+    {
+        /// <summary>
+        /// Name of the view extension.
+        /// </summary>
+        public string Name { get; set; }
+        /// <summary>
+        /// UniqueId of the view extension.
+        /// </summary>
+        public string UniqueId { get; set; }
+        /// <summary>
+        /// Specifies how an extension UI control should be displayed.
+        /// </summary>
+        public ViewExtensionDisplayMode DisplayMode { get; set; }
+        /// <summary>
+        /// Window settings for the extension control when displayed in FloatingWindow mode.
+        /// </summary>
+        public WindowSettings WindowSettings { get; set; }
+    }
+
+    /// <summary>
+    /// Possible display modes for an extension UI control.
+    /// </summary>
+    public enum ViewExtensionDisplayMode
+    {
+        /// <summary>
+        /// Not really a display mode but rather the absence of one.
+        /// </summary>
+        Unspecified,
+        /// <summary>
+        /// Extension control should be displayed docked to the right side.
+        /// </summary>
+        DockRight,
+        /// <summary>
+        /// Extension control should be displayed in a floating window.
+        /// </summary>
+        FloatingWindow
+    }
+
+    /// <summary>
+    /// Settings that define how to display an extension control in floating window mode.
+    /// </summary>
+    public class WindowSettings
+    {
+        /// <summary>
+        /// Status of the window, i.e. whether it is maximized.
+        /// </summary>
+        public WindowStatus Status { get; set; }
+        /// <summary>
+        /// Coordinates of the leftmost side of the window.
+        /// </summary>
+        public int Left { get; set; }
+        /// <summary>
+        /// Coordinates of the topmost side of the window.
+        /// </summary>
+        public int Top { get; set; }
+        /// <summary>
+        /// Width of the window.
+        /// </summary>
+        public int Width { get; set; }
+        /// <summary>
+        /// Height of the window.
+        /// </summary>
+        public int Height { get; set; }
+    }
+
+    /// <summary>
+    /// Possible status of a floating window.
+    /// </summary>
+    public enum WindowStatus
+    {
+        /// <summary>
+        /// The window can be moved and resized.
+        /// </summary>
+        Normal,
+        /// <summary>
+        /// The window is maximized.
+        /// </summary>
+        Maximized
+    }
+}

src/DynamoCore/DynamoCore.csproj

@@ -102,6 +102,7 @@ limitations under the License.
       <Link>Properties\AssemblySharedInfo.cs</Link>
     </Compile>
     <Compile Include="Configuration\ExecutionSession.cs" />
+    <Compile Include="Configuration\ViewExtensionSettings.cs" />
     <Compile Include="Core\CrashPromptArgs.cs" />
     <Compile Include="Configuration\DebugSettings.cs" />
     <Compile Include="Configuration\Context.cs" />

src/DynamoCoreWpf/Extensions/ViewLoadedParams.cs

@@ -98,9 +98,9 @@ public void AddMenuItem(MenuBarType type, MenuItem menuItem, int index = -1)
         /// <returns></returns>
         public void AddToExtensionsSideBar(IViewExtension viewExtension, ContentControl contentControl)
         {
-            TabItem tabItem  = dynamoView.AddExtensionTabItem(viewExtension, contentControl);
+            bool added  = dynamoView.AddOrFocusExtensionControl(viewExtension, contentControl);
 
-            if (tabItem != null)
+            if (added)
             {
                 dynamoViewModel.Model.Logger.Log(Wpf.Properties.Resources.ExtensionAdded);
             }