Fixed the sometimes incorrect use of ComponentPlaceholder.isShowing()

Ghidra/Framework/Docking/src/main/java/docking/ComponentNode.java

@@ -167,7 +167,7 @@ class ComponentNode extends Node {
 	void add(ComponentPlaceholder placeholder) {
 		windowPlaceholders.add(placeholder);
 		placeholder.setNode(this);
-		if (placeholder.isShowing()) {
+		if (placeholder.isActive()) {
 			top = placeholder;
 			invalidate();
 		}
@@ -185,7 +185,7 @@ class ComponentNode extends Node {
 			return;   // this node has been disconnected.
 		}
 
-		if (placeholder.isShowing()) {
+		if (placeholder.isActive()) {
 			if (top == placeholder) {
 				top = null;
 			}
@@ -212,7 +212,7 @@ class ComponentNode extends Node {
 	 * @param keepEmptyPlaceholder flag indicating to keep a placeholder placeholder object.
 	 */
 	void remove(ComponentPlaceholder placeholder, boolean keepEmptyPlaceholder) {
-		if (placeholder.isShowing()) {
+		if (placeholder.isActive()) {
 			placeholder.show(false);
 			if (top == placeholder) {
 				top = null;
@@ -241,9 +241,7 @@ class ComponentNode extends Node {
 		Iterator<ComponentPlaceholder> it = list.iterator();
 		while (it.hasNext()) {
 			ComponentPlaceholder placeholder = it.next();
-			if (placeholder.isShowing()) {
-				placeholder.close();
-			}
+			placeholder.close();
 		}
 	}
 
@@ -404,7 +402,7 @@ class ComponentNode extends Node {
 	@Override
 	void populateActiveComponents(List<ComponentPlaceholder> list) {
 		for (ComponentPlaceholder placeholder : windowPlaceholders) {
-			if (placeholder.isShowing()) {
+			if (placeholder.isActive()) {
 				list.add(placeholder);
 			}
 		}
@@ -508,7 +506,7 @@ class ComponentNode extends Node {
 			elem.setAttribute("NAME", placeholder.getName());
 			elem.setAttribute("OWNER", placeholder.getOwner());
 			elem.setAttribute("TITLE", placeholder.getTitle());
-			elem.setAttribute("ACTIVE", "" + placeholder.isShowing());
+			elem.setAttribute("ACTIVE", "" + placeholder.isActive());
 			elem.setAttribute("GROUP", placeholder.getGroup());
 			elem.setAttribute("INSTANCE_ID", Long.toString(placeholder.getInstanceID()));
 			root.addContent(elem);
@@ -516,13 +514,10 @@ class ComponentNode extends Node {
 		return root;
 	}
 
-	//
-	// Tabbed pane listener methods
-	//
 	@Override
 	boolean contains(ComponentPlaceholder placeholder) {
 		for (ComponentPlaceholder ph : windowPlaceholders) {
-			if (ph.isShowing() && ph.equals(placeholder)) {
+			if (ph.isActive() && ph.equals(placeholder)) {
 				return true;
 			}
 		}

Ghidra/Framework/Docking/src/main/java/docking/ComponentPlaceholder.java

@@ -136,10 +136,21 @@ public class ComponentPlaceholder {
 	}
 
 	/**
-	 * Returns true if the component is not hidden
+	 * Returns true if the component is showing and visible to the user.
 	 * @return true if showing
+	 * @see #isActive()
 	 */
 	boolean isShowing() {
+		return isShowing && comp != null && comp.isShowing();
+	}
+
+	/**
+	 * Returns true if this provider wants to be showing and has a component provider, regardless 
+	 * of whether the provider is showing to the user.
+	 * @return true if active
+	 * @see #isShowing()
+	 */
+	boolean isActive() {
 		return isShowing && componentProvider != null;
 	}
 

Ghidra/Framework/Docking/src/main/java/docking/DockingWindowManager.java

@@ -830,7 +830,7 @@ public class DockingWindowManager implements PropertyChangeListener, Placeholder
 			return;
 		}
 
-		if (!placeholder.isShowing()) {
+		if (!placeholder.isActive()) {
 			showComponent(placeholder, true, false);
 		}
 
@@ -947,7 +947,7 @@ public class DockingWindowManager implements PropertyChangeListener, Placeholder
 			return;
 		}
 
-		if (visibleState == placeholder.isShowing()) {
+		if (visibleState == placeholder.isActive()) {
 			if (visibleState) {
 				movePlaceholderToFront(placeholder, shouldEmphasize);
 				setNextFocusPlaceholder(placeholder);

Ghidra/Framework/Docking/src/main/java/docking/PlaceholderManager.java

@@ -4,9 +4,9 @@
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
  * You may obtain a copy of the License at
- * 
+ *
  *      http://www.apache.org/licenses/LICENSE-2.0
- * 
+ *
  * Unless required by applicable law or agreed to in writing, software
  * distributed under the License is distributed on an "AS IS" BASIS,
  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@@ -63,7 +63,7 @@ class PlaceholderManager {
 			restoredPlaceholder.showHeader(false);
 		}
 
-		if (defaultPlaceholder.isShowing() != restoredPlaceholder.isShowing()) {
+		if (defaultPlaceholder.isActive() != restoredPlaceholder.isActive()) {
 			if (restoredPlaceholder.isShowing()) {
 				provider.componentShown();
 			}