Don't use display thread for scheduling console update tasks

debug/org.eclipse.ui.console/.settings/.api_filters

@@ -0,0 +1,17 @@
+<?xml version="1.0" encoding="UTF-8" standalone="no"?>
+<component id="org.eclipse.ui.console" version="2">
+    <resource path="src/org/eclipse/ui/console/IConsole.java" type="org.eclipse.ui.console.IConsole">
+        <filter id="404000815">
+            <message_arguments>
+                <message_argument value="org.eclipse.ui.console.IConsole"/>
+                <message_argument value="pageHidden()"/>
+            </message_arguments>
+        </filter>
+        <filter id="404000815">
+            <message_arguments>
+                <message_argument value="org.eclipse.ui.console.IConsole"/>
+                <message_argument value="pageShown()"/>
+            </message_arguments>
+        </filter>
+    </resource>
+</component>

debug/org.eclipse.ui.console/src/org/eclipse/ui/console/AbstractConsole.java

@@ -39,17 +39,17 @@ public abstract class AbstractConsole implements IConsole {
 	/**
 	 * Console name
 	 */
-	private String fName = null;
+	private String fName;
 
 	/**
 	 * Console image descriptor
 	 */
-	private ImageDescriptor fImageDescriptor = null;
+	private ImageDescriptor fImageDescriptor;
 
 	/**
 	 * Console type identifier
 	 */
-	private String fType = null;
+	private String fType;
 
 	/**
 	 * Used to notify this console of lifecycle methods <code>init()</code>
@@ -316,4 +316,9 @@ public String getHelpContextId() {
 		return null;
 	}
 
+	@Override
+	public String toString() {
+		return "Console [" + fName + "]"; //$NON-NLS-1$ //$NON-NLS-2$
+	}
+
 }

debug/org.eclipse.ui.console/src/org/eclipse/ui/console/IConsole.java

@@ -97,4 +97,40 @@ public interface IConsole {
 	 */
 	String getType();
 
+	/**
+	 * Notifies this console that its page has been shown in the UI. This method is
+	 * called when this console page is shown on top of other console pages in at
+	 * least one <b>visible</b> console view.
+	 * <p>
+	 * Default implementation does nothing.
+	 * </p>
+	 * <p>
+	 * Subclasses may override this method to be notified when the console page for
+	 * this console is visible to user.
+	 * </p>
+	 *
+	 * @since 3.16
+	 */
+	default void pageShown() {
+		// Subclasses may override
+	}
+
+	/**
+	 * Notifies this console that its page has been hidden in the UI. This method is
+	 * called when this console page is not shown on top of other console pages in
+	 * any of <b>visible</b> console views.
+	 * <p>
+	 * Default implementation does nothing.
+	 * </p>
+	 * <p>
+	 * Subclasses may override this method to be notified when the console page for
+	 * this console is not more visible to user.
+	 * </p>
+	 *
+	 * @since 3.16
+	 */
+	default void pageHidden() {
+		// Subclasses may override
+	}
+
 }

debug/org.eclipse.ui.console/src/org/eclipse/ui/console/IConsoleManager.java

@@ -107,4 +107,37 @@ public interface IConsoleManager {
 	 */
 	void refresh(IConsole console);
 
+	/**
+	 * Notifies that given console has been shown in the UI (either the view with
+	 * given console on top has been shown or the console has been switched to the
+	 * top console in at least one view).
+	 *
+	 * <p>
+	 * Note, there could be multiple views showing the same console, so the page
+	 * with given console can be still hidden in some views.
+	 * </p>
+	 *
+	 * @param console the top console from view that has been shown
+	 *
+	 * @since 3.16
+	 */
+	default void consoleShown(IConsole console) {
+	}
+
+	/**
+	 * Notifies that given console that was on top of at least one view has been
+	 * hidden in the UI (either the console is not the top page in the view or the
+	 * view with given console on top has been hidden).
+	 * <p>
+	 * Note, there could be multiple views showing the same console, so the page
+	 * with given console can be still shown in some views.
+	 * </p>
+	 *
+	 * @param console the console that has been hidden
+	 *
+	 * @since 3.16
+	 */
+	default void consoleHidden(IConsole console) {
+	}
+
 }

debug/org.eclipse.ui.console/src/org/eclipse/ui/console/IOConsole.java

@@ -54,7 +54,7 @@ public class IOConsole extends TextConsole {
 	/**
 	 * A collection of open streams connected to this console.
 	 */
-	private final List<Closeable> openStreams = Collections.synchronizedList(new ArrayList<>());
+	private final List<Closeable> openStreams;
 
 	/**
 	 * The encoding used to for displaying console output.
@@ -113,10 +113,9 @@ public IOConsole(String name, String consoleType, ImageDescriptor imageDescripto
 	public IOConsole(String name, String consoleType, ImageDescriptor imageDescriptor, Charset charset, boolean autoLifecycle) {
 		super(name, consoleType, imageDescriptor, autoLifecycle);
 		this.charset = charset;
-		synchronized (openStreams) {
-			inputStream = new IOConsoleInputStream(this);
-			openStreams.add(inputStream);
-		}
+		openStreams = Collections.synchronizedList(new ArrayList<>());
+		inputStream = new IOConsoleInputStream(this);
+		openStreams.add(inputStream);
 		partitioner = new IOConsolePartitioner(this);
 		final IDocument document = getDocument();
 		if (document != null) {

debug/org.eclipse.ui.console/src/org/eclipse/ui/console/TextConsole.java

@@ -83,28 +83,27 @@ public abstract class TextConsole extends AbstractConsole {
 	/**
 	 * indication that the console's partitioner is not expecting more input
 	 */
-	private volatile boolean fPartitionerFinished = false;
+	private volatile boolean fPartitionerFinished;
 
 	/**
 	 * Indication that the console's pattern matcher has finished.
 	 * (all matches have been found and all listeners notified)
 	 */
-	private volatile boolean fMatcherFinished = false;
+	private volatile boolean fMatcherFinished;
 
 	/**
 	 * indication that the console output complete property has been fired
 	 */
-	private boolean fCompleteFired = false;
-
-	private volatile boolean fConsoleAutoScrollLock = true;
+	private boolean fCompleteFired;
 
+	private volatile boolean fConsoleAutoScrollLock;
 
 	/**
 	 * Map of client defined attributes
 	 */
-	private final HashMap<String, Object> fAttributes = new HashMap<>();
+	private final HashMap<String, Object> fAttributes;
 
-	private final IConsoleManager fConsoleManager = ConsolePlugin.getDefault().getConsoleManager();
+	private final IConsoleManager fConsoleManager;
 	private ScopedPreferenceStore store;
 	private IPropertyChangeListener propListener;
 
@@ -119,6 +118,7 @@ protected void dispose() {
 			store.removePropertyChangeListener(propListener);
 		}
 	}
+
 	/**
 	 * Constructs a console with the given name, image descriptor, and lifecycle
 	 *
@@ -130,6 +130,9 @@ protected void dispose() {
 	 */
 	public TextConsole(String name, String consoleType, ImageDescriptor imageDescriptor, boolean autoLifecycle) {
 		super(name, consoleType, imageDescriptor, autoLifecycle);
+		fConsoleAutoScrollLock = true;
+		fAttributes = new HashMap<>();
+		fConsoleManager = ConsolePlugin.getDefault().getConsoleManager();
 		fDocument = new ConsoleDocument();
 		fDocument.addPositionCategory(ConsoleHyperlinkPosition.HYPER_LINK_CATEGORY);
 		fPatternMatcher = new ConsolePatternMatcher(this);