GP-757 - Function Graph - added options to set background color for

graph view and for the vertices

Closes #1324

Ghidra/Features/FunctionGraph/src/main/java/ghidra/app/plugin/core/functiongraph/FGProvider.java

@@ -578,6 +578,10 @@ public class FGProvider extends VisualGraphComponentProvider<FGVertex, FGEdge, F
 		}
 	}
 
+	public void optionsChanged() {
+		controller.optionsChanged();
+	}
+
 	@Override
 	public void domainObjectChanged(DomainObjectChangedEvent ev) {
 		if (!isVisible()) {

Ghidra/Features/FunctionGraph/src/main/java/ghidra/app/plugin/core/functiongraph/FunctionGraphPlugin.java

@@ -172,6 +172,8 @@ public class FunctionGraphPlugin extends ProgramPlugin implements OptionsChangeL
 
 		functionGraphOptions.loadOptions(options);
 
+		connectedProvider.optionsChanged();
+
 		if (functionGraphOptions.optionChangeRequiresRelayout(optionName)) {
 			connectedProvider.refreshAndKeepPerspective();
 		}

Ghidra/Features/FunctionGraph/src/main/java/ghidra/app/plugin/core/functiongraph/graph/FGComponent.java

@@ -36,6 +36,7 @@ import ghidra.graph.viewer.*;
 import ghidra.graph.viewer.layout.LayoutListener.ChangeType;
 import ghidra.graph.viewer.layout.LayoutProvider;
 import ghidra.graph.viewer.layout.VisualGraphLayout;
+import ghidra.graph.viewer.options.VisualGraphOptions;
 import ghidra.graph.viewer.renderer.VisualGraphEdgeLabelRenderer;
 import ghidra.program.model.listing.Function;
 import ghidra.program.util.ProgramLocation;
@@ -65,6 +66,8 @@ public class FGComponent extends GraphComponent<FGVertex, FGEdge, FunctionGraph>
 		//       the base class builds.
 		// super(data.getFunctionGraph());
 
+		setGraphOptions(functionGraphView.getController().getFunctionGraphOptions());
+
 		setGraph(data.getFunctionGraph());
 
 		this.functionGraphView = functionGraphView;
@@ -217,7 +220,12 @@ public class FGComponent extends GraphComponent<FGVertex, FGEdge, FunctionGraph>
 		edgeLabelRenderer.setRotateEdgeLabels(false);
 		renderContext.setEdgeLabelRenderer(edgeLabelRenderer);
 
-		// Give user notice when seeing the graph for a non-function.
+		viewer.setGraphOptions(options);
+		Color bgColor = options.getGraphBackgroundColor();
+		if (bgColor.equals(VisualGraphOptions.DEFAULT_GRAPH_BACKGROUND_COLOR)) {
+
+			// Give user notice when seeing the graph for a non-function.  Don't do this if the
+			// user has manually set the background color (this would require another option).
 			Function function = functionGraphData.getFunction();
 			if (function instanceof UndefinedFunction) {
 				viewer.setBackground(UNDEFINED_FUNCTION_COLOR);
@@ -225,6 +233,7 @@ public class FGComponent extends GraphComponent<FGVertex, FGEdge, FunctionGraph>
 			else {
 				viewer.setBackground(Color.WHITE);
 			}
+		}
 
 		return viewer;
 	}
@@ -248,6 +257,8 @@ public class FGComponent extends GraphComponent<FGVertex, FGEdge, FunctionGraph>
 		renderContext.setVertexFillPaintTransformer(new FGVertexPickableBackgroundPaintTransformer(
 			pickedVertexState, Color.YELLOW, START_COLOR, END_COLOR));
 
+		viewer.setGraphOptions(options);
+
 		return viewer;
 	}
 
@@ -274,7 +285,7 @@ public class FGComponent extends GraphComponent<FGVertex, FGEdge, FunctionGraph>
 //==================================================================================================
 
 	public FunctionGraphOptions getFucntionGraphOptions() {
-		return functionGraphView.getController().getFunctionGraphOptions();
+		return (FunctionGraphOptions) options;
 	}
 
 	public void ensureCursorVisible(FGVertex vertex) {

Ghidra/Features/FunctionGraph/src/main/java/ghidra/app/plugin/core/functiongraph/graph/FGPrimaryViewer.java

@@ -33,7 +33,6 @@ public class FGPrimaryViewer extends GraphViewer<FGVertex, FGEdge> {
 		super(layout, size);
 
 		setVertexTooltipProvider(new FGVertexTooltipProvider());
-		setGraphOptions(graphComponent.getFucntionGraphOptions());
 	}
 
 	@Override

Ghidra/Features/FunctionGraph/src/main/java/ghidra/app/plugin/core/functiongraph/graph/vertex/AbstractGraphComponentPanel.java

@@ -140,9 +140,6 @@ public abstract class AbstractGraphComponentPanel extends JPanel {
 		}
 
 		Component header = getHeader();
-		if (clickedComponent == null) {
-			return false;
-		}
 		return SwingUtilities.isDescendingFrom(clickedComponent, header);
 	}
 

Ghidra/Features/FunctionGraph/src/main/java/ghidra/app/plugin/core/functiongraph/graph/vertex/FGVertex.java

@@ -98,7 +98,7 @@ public interface FGVertex extends VisualVertex {
 	 * grouped, but that it has been part of a group and can be put back into its group form 
 	 * again.
 	 * 
-	 * @param groupMember True if this vertex is a associate with a group
+	 * @param groupInfo True if this vertex is a associate with a group
 	 */
 	public void updateGroupAssociationStatus(GroupHistoryInfo groupInfo);
 
@@ -190,8 +190,8 @@ public interface FGVertex extends VisualVertex {
 	public void refreshDisplay();
 
 	/**
-	 * Refresh the vertex's display information if the given address is the entry point
+	 * Refresh the vertex's display information if the given address is the vertex entry point
-	 * of the vertex.
+	 * @param address the addresses
 	 */
 	public void refreshDisplayForAddress(Address address);
 

Ghidra/Features/FunctionGraph/src/main/java/ghidra/app/plugin/core/functiongraph/graph/vertex/FGVertexListingPanel.java

@@ -15,6 +15,7 @@
  */
 package ghidra.app.plugin.core.functiongraph.graph.vertex;
 
+import java.awt.Color;
 import java.awt.Dimension;
 import java.math.BigInteger;
 import java.util.ArrayList;
@@ -23,6 +24,7 @@ import java.util.List;
 import docking.widgets.fieldpanel.*;
 import ghidra.app.plugin.core.functiongraph.FGColorProvider;
 import ghidra.app.plugin.core.functiongraph.mvc.FGController;
+import ghidra.app.plugin.core.functiongraph.mvc.FunctionGraphOptions;
 import ghidra.app.util.viewer.format.FormatManager;
 import ghidra.app.util.viewer.listingpanel.*;
 import ghidra.program.model.address.AddressSetView;
@@ -66,6 +68,10 @@ public class FGVertexListingPanel extends ListingPanel {
 		ListingModel model = getListingModel();
 		model.addListener(listener);
 
+		FunctionGraphOptions options = controller.getFunctionGraphOptions();
+		Color color = options.getDefaultVertexBackgroundColor();
+		setTextBackgroundColor(color);
+
 		FGColorProvider colorProvider = controller.getColorProvider();
 		if (!colorProvider.isUsingCustomColors()) {
 			enablePropertyBasedColorModel(true); // turn on user colors in the graph

Ghidra/Features/FunctionGraph/src/main/java/ghidra/app/plugin/core/functiongraph/graph/vertex/GroupedFunctionGraphComponentPanel.java

@@ -382,6 +382,7 @@ public class GroupedFunctionGraphComponentPanel extends AbstractGraphComponentPa
 	}
 
 	private void doSetBackgroundColor(Color color) {
+		setBackground(color);
 		contentPanel.setBackground(color);
 		userTextArea.setBackground(color);
 		controller.removeColor(vertex);
@@ -561,12 +562,26 @@ public class GroupedFunctionGraphComponentPanel extends AbstractGraphComponentPa
 
 	@Override
 	void refreshDisplay() {
+
+		updateDefaultBackgroundColor();
+
 		Set<FGVertex> vertices = groupVertex.getVertices();
 		for (FGVertex v : vertices) {
 			v.refreshDisplay();
 		}
 	}
 
+	private void updateDefaultBackgroundColor() {
+		FunctionGraphOptions options = controller.getFunctionGraphOptions();
+		Color newBgColor = options.getDefaultGroupBackgroundColor();
+		if (!defaultBackgroundColor.equals(newBgColor)) {
+			defaultBackgroundColor = newBgColor;
+			if (userDefinedColor == null) {
+				doSetBackgroundColor(defaultBackgroundColor);
+			}
+		}
+	}
+
 	@Override
 	void refreshDisplayForAddress(Address address) {
 		Set<FGVertex> vertices = groupVertex.getVertices();

Ghidra/Features/FunctionGraph/src/main/java/ghidra/app/plugin/core/functiongraph/graph/vertex/ListingGraphComponentPanel.java

@@ -251,6 +251,19 @@ public class ListingGraphComponentPanel extends AbstractGraphComponentPanel {
 		title = createTitle();
 		genericHeader.setTitle(title);
 		previewListingPanel = null;
+
+		updateDefaultBackgroundColor();
+	}
+
+	private void updateDefaultBackgroundColor() {
+		FunctionGraphOptions options = controller.getFunctionGraphOptions();
+		Color newBgColor = options.getDefaultVertexBackgroundColor();
+		if (!defaultBackgroundColor.equals(newBgColor)) {
+			defaultBackgroundColor = newBgColor;
+			if (userDefinedColor == null) {
+				listingPanel.setTextBackgroundColor(defaultBackgroundColor);
+			}
+		}
 	}
 
 	@Override
@@ -522,7 +535,8 @@ public class ListingGraphComponentPanel extends AbstractGraphComponentPanel {
 			tooltipTitleLabel.setText("From: " + getTitle());
 		}
 
-		previewListingPanel.getFieldPanel().setBackgroundColorModel(
+		previewListingPanel.getFieldPanel()
+				.setBackgroundColorModel(
 					new HighlightingColorModel(address, getColorForEdge(edge)));
 	}
 

Ghidra/Features/FunctionGraph/src/main/java/ghidra/app/plugin/core/functiongraph/mvc/FGController.java

@@ -332,7 +332,8 @@ public class FGController implements ProgramLocationListener, ProgramSelectionLi
 	}
 
 	private boolean shouldSaveVertexChanges() {
-		return functionGraphOptions.getNavigationHistoryChoice() == NavigationHistoryChoices.VERTEX_CHANGES;
+		return functionGraphOptions
+				.getNavigationHistoryChoice() == NavigationHistoryChoices.VERTEX_CHANGES;
 	}
 
 	@Override
@@ -634,6 +635,10 @@ public class FGController implements ProgramLocationListener, ProgramSelectionLi
 		viewSettings.setLocation(location);
 	}
 
+	public void optionsChanged() {
+		view.optionsChanged();
+	}
+
 	public void refreshDisplayWithoutRebuilding() {
 		view.refreshDisplayWithoutRebuilding();
 	}

Ghidra/Features/FunctionGraph/src/main/java/ghidra/app/plugin/core/functiongraph/mvc/FGView.java

@@ -73,7 +73,6 @@ public class FGView extends VisualGraphView<FGVertex, FGEdge, FunctionGraph> {
 	protected void installGraphViewer() {
 
 		FGComponent newFgComponent = createGraphComponent();
-		newFgComponent.setGraphOptions(controller.getFunctionGraphOptions());
 		setGraphComponent(newFgComponent);
 
 		// we must assign the variable here, as the call to setGraphComponent() will call 

Ghidra/Features/FunctionGraph/src/main/java/ghidra/app/plugin/core/functiongraph/mvc/FunctionGraphOptions.java

@@ -70,6 +70,10 @@ public class FunctionGraphOptions extends VisualGraphOptions {
 		"<li><b>Never</b> - do not automatically relayout the graph</li></ul><br><br>" +
 		"<b><i>See help for more</i></b>";
 
+	private static final String DEFAULT_VERTEX_BACKGROUND_COLOR_KEY = "Default Vertex Color";
+	private static final String DEFAULT_VERTEX_BACKGROUND_COLOR_DESCRPTION =
+		"The default background color applied to each vertex";
+
 	private static final String DEFAULT_GROUP_BACKGROUND_COLOR_KEY = "Default Group Color";
 	private static final String DEFAULT_GROUP_BACKGROUND_COLOR_DESCRPTION =
 		"The default background color applied to newly created group vertices";
@@ -80,11 +84,14 @@ public class FunctionGraphOptions extends VisualGraphOptions {
 		"Signals that any user color changes to a group vertex will apply that same color to " +
 			"all grouped vertices as well.";
 
+	public static final Color DEFAULT_VERTEX_BACKGROUND_COLOR = Color.WHITE;
 	public static final Color DEFAULT_GROUP_BACKGROUND_COLOR = new Color(226, 255, 155);
 	private static final Color HOVER_HIGHLIGHT_FALL_THROUGH_COLOR = new Color(255, 127, 127);
 	private static final Color HOVER_HIGHLIGHT_UNCONDITIONAL_COLOR = new Color(127, 127, 255);
 	private static final Color HOVER_HIGHLIGHT_CONDITIONAL_COLOR = Color.GREEN;
 
+	private Color defaultVertexBackgroundColor = DEFAULT_VERTEX_BACKGROUND_COLOR;
+
 	private boolean updateGroupColorsAutomatically = true;
 	private Color defaultGroupBackgroundColor = DEFAULT_GROUP_BACKGROUND_COLOR;
 
@@ -104,6 +111,10 @@ public class FunctionGraphOptions extends VisualGraphOptions {
 
 	private Map<String, FGLayoutOptions> layoutOptionsByName = new HashMap<>();
 
+	public Color getDefaultVertexBackgroundColor() {
+		return defaultVertexBackgroundColor;
+	}
+
 	public Color getDefaultGroupBackgroundColor() {
 		return defaultGroupBackgroundColor;
 	}
@@ -174,6 +185,12 @@ public class FunctionGraphOptions extends VisualGraphOptions {
 		options.registerOption(SCROLL_WHEEL_PANS_KEY, getScrollWheelPans(), help,
 			SCROLL_WHEEL_PANS_DESCRIPTION);
 
+		options.registerOption(GRAPH_BACKGROUND_COLOR_KEY, DEFAULT_GRAPH_BACKGROUND_COLOR,
+			help, GRAPH_BACKGROUND_COLOR_DESCRPTION);
+
+		options.registerOption(DEFAULT_VERTEX_BACKGROUND_COLOR_KEY, DEFAULT_VERTEX_BACKGROUND_COLOR,
+			help, DEFAULT_VERTEX_BACKGROUND_COLOR_DESCRPTION);
+
 		options.registerOption(DEFAULT_GROUP_BACKGROUND_COLOR_KEY, DEFAULT_GROUP_BACKGROUND_COLOR,
 			help, DEFAULT_GROUP_BACKGROUND_COLOR_DESCRPTION);
 
@@ -242,6 +259,12 @@ public class FunctionGraphOptions extends VisualGraphOptions {
 
 		scrollWheelPans = options.getBoolean(SCROLL_WHEEL_PANS_KEY, scrollWheelPans);
 
+		graphBackgroundColor =
+			options.getColor(GRAPH_BACKGROUND_COLOR_KEY, DEFAULT_GRAPH_BACKGROUND_COLOR);
+
+		defaultVertexBackgroundColor =
+			options.getColor(DEFAULT_VERTEX_BACKGROUND_COLOR_KEY, DEFAULT_VERTEX_BACKGROUND_COLOR);
+
 		defaultGroupBackgroundColor =
 			options.getColor(DEFAULT_GROUP_BACKGROUND_COLOR_KEY, DEFAULT_GROUP_BACKGROUND_COLOR);
 
@@ -308,5 +331,4 @@ public class FunctionGraphOptions extends VisualGraphOptions {
 	public void setLayoutOptions(String layoutName, FGLayoutOptions options) {
 		layoutOptionsByName.put(layoutName, options);
 	}
-
 }

Ghidra/Framework/Graph/src/main/java/ghidra/graph/viewer/GraphComponent.java

@@ -124,7 +124,7 @@ public class GraphComponent<V extends VisualVertex, E extends VisualEdge<V>, G e
 	// a cache to prevent unnecessary layout calculations
 	private Dimension lastSize;
 
-	private VisualGraphOptions options = new VisualGraphOptions();
+	protected VisualGraphOptions options = new VisualGraphOptions();
 
 	public GraphComponent(G graph) {
 
@@ -208,9 +208,7 @@ public class GraphComponent<V extends VisualVertex, E extends VisualEdge<V>, G e
 		renderContext.setVertexFillPaintTransformer(
 			new PickableVertexPaintTransformer<>(pickedVertexState, Color.WHITE, Color.YELLOW));
 
-		viewer.setBackground(Color.WHITE);
+		viewer.setGraphOptions(options);
-
-		viewer.setGraphOptions(new VisualGraphOptions());
 
 		return viewer;
 	}
@@ -297,6 +295,8 @@ public class GraphComponent<V extends VisualVertex, E extends VisualEdge<V>, G e
 
 		SatelliteGraphViewer<V, E> viewer = createSatelliteGraphViewer(masterViewer, viewerSize);
 
+		viewer.setGraphOptions(options);
+
 		viewer.setMinimumSize(viewerSize);
 		viewer.setMaximumSize(viewerSize);
 
@@ -525,6 +525,15 @@ public class GraphComponent<V extends VisualVertex, E extends VisualEdge<V>, G e
 
 	public void setGraphOptions(VisualGraphOptions options) {
 		this.options = options;
+
+		// the viewers may be null if called during initialization
+		if (primaryViewer != null) {
+			primaryViewer.setGraphOptions(options);
+		}
+
+		if (satelliteViewer != null) {
+			satelliteViewer.setGraphOptions(options);
+		}
 	}
 
 	public boolean isUninitialized() {
@@ -562,6 +571,11 @@ public class GraphComponent<V extends VisualVertex, E extends VisualEdge<V>, G e
 		return mainPanel;
 	}
 
+	public void optionsChanged() {
+		primaryViewer.optionsChanged();
+		satelliteViewer.optionsChanged();
+	}
+
 	public void repaint() {
 		mainPanel.repaint();
 	}

Ghidra/Framework/Graph/src/main/java/ghidra/graph/viewer/GraphViewer.java

@@ -88,7 +88,7 @@ public class GraphViewer<V extends VisualVertex, E extends VisualEdge<V>>
 		gPickedState = new GPickedState<>((MultiPickedState<V>) pickedState);
 		setPickedVertexState(gPickedState);
 
-		popupRegulator = new PopupRegulator<V, E>(new GraphViewerPopupSource());
+		popupRegulator = new PopupRegulator<>(new GraphViewerPopupSource());
 	}
 
 	private void buildUpdater() {
@@ -158,6 +158,11 @@ public class GraphViewer<V extends VisualVertex, E extends VisualEdge<V>>
 
 	public void setGraphOptions(VisualGraphOptions options) {
 		this.options = options;
+		optionsChanged();
+	}
+
+	public void optionsChanged() {
+		setBackground(options.getGraphBackgroundColor());
 	}
 
 	public VisualGraphOptions getOptions() {

Ghidra/Framework/Graph/src/main/java/ghidra/graph/viewer/SatelliteGraphViewer.java

@@ -21,6 +21,7 @@ import edu.uci.ics.jung.visualization.control.SatelliteVisualizationViewer;
 import edu.uci.ics.jung.visualization.renderers.Renderer;
 import ghidra.graph.viewer.event.mouse.VisualGraphPluggableGraphMouse;
 import ghidra.graph.viewer.event.mouse.VisualGraphSatelliteGraphMouse;
+import ghidra.graph.viewer.options.VisualGraphOptions;
 import ghidra.graph.viewer.renderer.VisualGraphRenderer;
 import ghidra.graph.viewer.renderer.VisualVertexSatelliteRenderer;
 
@@ -36,6 +37,7 @@ public class SatelliteGraphViewer<V extends VisualVertex, E extends VisualEdge<V
 
 	protected GraphViewer<V, E> graphViewer;
 	private boolean docked;
+	private VisualGraphOptions options;
 
 	public SatelliteGraphViewer(GraphViewer<V, E> master, Dimension preferredSize) {
 		super(master, preferredSize);
@@ -73,6 +75,15 @@ public class SatelliteGraphViewer<V extends VisualVertex, E extends VisualEdge<V
 		return new VisualVertexSatelliteRenderer<>();
 	}
 
+	public void setGraphOptions(VisualGraphOptions options) {
+		this.options = options;
+		optionsChanged();
+	}
+
+	public void optionsChanged() {
+		setBackground(options.getGraphBackgroundColor());
+	}
+
 	@SuppressWarnings("unchecked")
 	@Override
 	public VisualGraphPluggableGraphMouse<V, E> getGraphMouse() {
@@ -87,5 +98,4 @@ public class SatelliteGraphViewer<V extends VisualVertex, E extends VisualEdge<V
 		}
 		super.setGraphMouse(graphMouse);
 	}
-
 }

Ghidra/Framework/Graph/src/main/java/ghidra/graph/viewer/VisualGraphView.java

@@ -31,7 +31,6 @@ import ghidra.graph.VisualGraph;
 import ghidra.graph.viewer.event.mouse.VertexTooltipProvider;
 import ghidra.graph.viewer.event.mouse.VisualGraphMousePlugin;
 import ghidra.graph.viewer.layout.LayoutProvider;
-import ghidra.graph.viewer.options.VisualGraphOptions;
 import ghidra.graph.viewer.vertex.VertexClickListener;
 import ghidra.graph.viewer.vertex.VertexFocusListener;
 
@@ -159,6 +158,13 @@ public class VisualGraphView<V extends VisualVertex,
 		undockedSatelliteContentPanel.validate();
 	}
 
+	/**
+	 * Called when the options used by this graph view have changed
+	 */
+	public void optionsChanged() {
+		graphComponent.optionsChanged();
+	}
+
 	/**
 	 * Sets the given layout provider, <b>but does not actually perform a layout</b>.
 	 * @param newLayoutProvider the new provider
@@ -201,7 +207,6 @@ public class VisualGraphView<V extends VisualVertex,
 
 	protected void installGraphViewer() {
 		GraphComponent<V, E, G> newGraphComponent = new GraphComponent<>(graph);
-		newGraphComponent.setGraphOptions(new VisualGraphOptions());
 		setGraphComponent(newGraphComponent);
 	}
 
@@ -522,7 +527,7 @@ public class VisualGraphView<V extends VisualVertex,
 	public MouseEvent translateMouseEventFromVertexToViewSpace(V v, MouseEvent e) {
 		Point viewerPoint = translatePointFromVertexToViewSpace(v, e.getPoint());
 		VisualizationViewer<V, E> newSource = getPrimaryGraphViewer();
-		return new MouseEvent(newSource, e.getID(), e.getWhen(), e.getModifiers(),
+		return new MouseEvent(newSource, e.getID(), e.getWhen(), e.getModifiersEx(),
 			(int) viewerPoint.getX(), (int) viewerPoint.getY(), e.getClickCount(),
 			e.isPopupTrigger(), e.getButton());
 	}

Ghidra/Framework/Graph/src/main/java/ghidra/graph/viewer/options/VisualGraphOptions.java

@@ -15,10 +15,16 @@
  */
 package ghidra.graph.viewer.options;
 
+import java.awt.Color;
+
 import docking.DockingUtils;
 
 public class VisualGraphOptions {
 
+	public static final String GRAPH_BACKGROUND_COLOR_KEY = "Graph Background Color";
+	public static final String GRAPH_BACKGROUND_COLOR_DESCRPTION =
+		"The graph display background color";
+
 	public static final String SHOW_ANIMATION_OPTIONS_KEY = "Use Animation";
 	public static final String SHOW_ANIMATION_DESCRIPTION = "Signals to the Function Graph to " +
 		"use animated transitions for certain operations, like navigation.";
@@ -48,6 +54,9 @@ public class VisualGraphOptions {
 		"new graphs and already rendered graphs are zoomed and positioned.  See the help for " +
 		"more details.";
 
+	public static final Color DEFAULT_GRAPH_BACKGROUND_COLOR = Color.WHITE;
+	protected Color graphBackgroundColor = DEFAULT_GRAPH_BACKGROUND_COLOR;
+
 	protected boolean useAnimation = true;
 	protected boolean scrollWheelPans = false;
 
@@ -59,6 +68,10 @@ public class VisualGraphOptions {
 
 	protected ViewRestoreOption viewRestoreOption = ViewRestoreOption.START_FULLY_ZOOMED_OUT;
 
+	public Color getGraphBackgroundColor() {
+		return graphBackgroundColor;
+	}
+
 	public boolean getScrollWheelPans() {
 		return scrollWheelPans;
 	}

Ghidra/Framework/Graph/src/test/java/ghidra/graph/algo/viewer/TestGraphAlgorithmSteppingViewerPanel.java

@@ -151,7 +151,6 @@ public class TestGraphAlgorithmSteppingViewerPanel<V, E extends GEdge<V>> extend
 
 		tvg.setLayout(layout);
 		viewer = new GraphViewer<>(layout, new Dimension(400, 400));
-		viewer.setBackground(Color.WHITE);
 		viewer.setGraphOptions(new VisualGraphOptions());
 
 		Renderer<AlgorithmTestSteppingVertex<V>, AlgorithmTestSteppingEdge<V>> renderer =