Allow for deselection of HighlightedValue. Fixes in BaseApp.

widgets/+wt/+apps/BaseApp.m

@@ -93,8 +93,21 @@ function forceUpdate(app)
     %% Constructor / destructor
     methods (Access = public)
 
-        function app = BaseApp(varargin)
+        function app = BaseApp(options)
+
             % Constructor
+
+            arguments
+                options.?wt.apps.BaseApp
+                options.Preferences (1,1) wt.model.Preferences = wt.model.Preferences;
+                options.PreferenceGroup (1,1) string = "";
+            end
+
+            % Check for preference input and assign it first, in case
+            % Preferences was subclassed
+            app.Preferences = options.Preferences;
+            app.PreferenceGroup = options.PreferenceGroup;
+            options = rmfield(options, ["Preferences" "PreferenceGroup"]);
 
             % Create the figure and hide until components are created
             app.Figure = uifigure( ...
@@ -132,8 +145,9 @@ function forceUpdate(app)
             app.setup();
 
             % Set any P-V pairs
-            if ~isempty(varargin)
-                set(app, varargin{:});
+            cellArgs = namedargs2cell(options);
+            if ~isempty(cellArgs)
+                set(app, cellArgs{:});
             end
 
             % Register the app with App Designer
@@ -151,11 +165,12 @@ function forceUpdate(app)
             % Update the title
             app.updateTitle();
 
-            % Force drawing to finish
-            drawnow
-
             % Now, make it visible
-            app.Figure.Visible = 'on';
+            if isfield(options, 'Visible')
+                app.Figure.Visible = options.Visible;
+            else
+                app.Figure.Visible = 'on';
+            end
 
         end %function
 
@@ -164,7 +179,13 @@ function delete(app)
             % Destructor
 
             % Store last position in preferences
-            if isscalar(app.Figure) && isvalid(app.Figure)
+
+            % Note: Use isprop instead of isvalid. 
+            % If a user deletes the figure instead of the app, 
+            % this delete method is still triggered. Although
+            % not yet fully deleted (prop values still available), 
+            % the app and figure are not valid at this point. 
+            if isscalar(app.Figure) && isprop(app.Figure, "Position")
                 app.setPreference('Position',app.Figure.Position)
             end
 
@@ -425,7 +446,7 @@ function updateTitle(app)
 
         function value = get.PreferenceGroup(app)
             value = app.PreferenceGroup;
-            if isempty(value)
+            if ~strlength(value)
                 value = class(app);
             end
             value = matlab.lang.makeValidName(value);

widgets/+wt/ListSelector.m

@@ -487,6 +487,10 @@ function shiftListBoxIndex(obj, shift)
             end
         end
         function set.HighlightedValue(obj,value)
+            if isempty(value)
+                obj.ListBox.Value = {};
+                return;
+            end
             if isempty(obj.ItemsData)
                 [~, obj.ListBox.Value] = ismember(value, obj.Items);
             else

widgets/+wt/ListSelectorTwoPane.m

@@ -546,6 +546,7 @@ function shiftListBoxIndex(obj, shift)
         end        
         function set.HighlightedValue(obj,value)
             if isempty(value)
+                obj.RightList.Value = {};
                 return;
             end
             if isempty(obj.ItemsData)