SwingConsolePane: update console only on the EDT

This avoids serious issues with multithreaded output,
as seen in TrakEM2 and reported by Stephen Saalfeld.

Unfortunately, there are substantial performance ramifications.
We may need to batch up the output into a queue, to minimize
the number of Runnables that get spawn and queued.

Author: ctrueden

src/main/java/org/scijava/ui/swing/console/SwingConsolePane.java

@@ -98,14 +98,21 @@ public void setWindow(final Component window) {
 	@Override
 	public void append(final OutputEvent event) {
 		if (consolePanel == null) initConsolePanel();
-		final boolean atBottom = StaticSwingUtils.isScrolledToBottom(scrollPane);
-		try {
-			doc.insertString(doc.getLength(), event.getOutput(), getStyle(event));
-		}
-		catch (final BadLocationException exc) {
-			throw new RuntimeException(exc);
-		}
-		if (atBottom) StaticSwingUtils.scrollToBottom(scrollPane);
+		threadService.queue(new Runnable() {
+
+			@Override
+			public void run() {
+				final boolean atBottom =
+					StaticSwingUtils.isScrolledToBottom(scrollPane);
+				try {
+					doc.insertString(doc.getLength(), event.getOutput(), getStyle(event));
+				}
+				catch (final BadLocationException exc) {
+					throw new RuntimeException(exc);
+				}
+				if (atBottom) StaticSwingUtils.scrollToBottom(scrollPane);
+			}
+		});
 	}
 
 	@Override