Index: trunk/src/org/openstreetmap/josm/gui/dialogs/changeset/ChangesetDiscussionPanel.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/dialogs/changeset/ChangesetDiscussionPanel.java	(revision 17787)
+++ trunk/src/org/openstreetmap/josm/gui/dialogs/changeset/ChangesetDiscussionPanel.java	(revision 17788)
@@ -27,4 +27,5 @@
 import org.openstreetmap.josm.gui.MainApplication;
 import org.openstreetmap.josm.gui.NoteInputDialog;
+import org.openstreetmap.josm.gui.widgets.LargeTextTable;
 import org.openstreetmap.josm.io.NetworkManager;
 import org.openstreetmap.josm.io.OnlineResource;
@@ -169,5 +170,5 @@
     private Component buildDiscussionPanel() {
         JPanel pnl = new JPanel(new BorderLayout());
-        table = new JTable(model, new ChangesetDiscussionTableColumnModel());
+        table = new LargeTextTable(model, new ChangesetDiscussionTableColumnModel());
         table.setRowSorter(new ChangesetDiscussionTableRowSorter(model));
         table.getTableHeader().setReorderingAllowed(false);
Index: trunk/src/org/openstreetmap/josm/gui/widgets/LargeTextTable.java
===================================================================
--- trunk/src/org/openstreetmap/josm/gui/widgets/LargeTextTable.java	(revision 17788)
+++ trunk/src/org/openstreetmap/josm/gui/widgets/LargeTextTable.java	(revision 17788)
@@ -0,0 +1,70 @@
+// License: GPL. For details, see LICENSE file.
+package org.openstreetmap.josm.gui.widgets;
+
+import java.awt.FontMetrics;
+import java.awt.Rectangle;
+
+import javax.swing.JTable;
+import javax.swing.SwingConstants;
+import javax.swing.table.TableColumnModel;
+import javax.swing.table.TableModel;
+
+/**
+ * Table with a scrolling behavior that is better suited for cells with large amounts of text.
+ * <p>
+ * The scrolling in the {@link javax.swing.JTable} is well suited for tables with rows of small and constant height.
+ * If the height of the rows varies greatly or if some cells contain a lot of text, the scrolling becomes messy.
+ * <p>
+ * This class {@code LargeTextTable} has the same scrolling behavior as {@link javax.swing.JTextArea}:
+ * scrolling increments depend on the font size.
+ */
+public class LargeTextTable extends JTable {
+
+    private int fontHeight;
+    private int charWidth;
+
+    public LargeTextTable(TableModel tableModel, TableColumnModel tableColumnModel) {
+        super(tableModel, tableColumnModel);
+    }
+
+    @Override
+    public int getScrollableUnitIncrement(Rectangle visibleRect, int orientation, int direction) {
+        switch (orientation) {
+            case SwingConstants.VERTICAL:
+                return getFontHeight();
+            case SwingConstants.HORIZONTAL:
+                return getCharWidth();
+            default:
+                throw new IllegalArgumentException("Invalid orientation: " + orientation);
+        }
+    }
+
+    @Override
+    public int getScrollableBlockIncrement(Rectangle visibleRect, int orientation, int direction) {
+        switch (orientation) {
+            case SwingConstants.VERTICAL:
+                return visibleRect.height;
+            case SwingConstants.HORIZONTAL:
+                return visibleRect.width;
+            default:
+                throw new IllegalArgumentException("Invalid orientation: " + orientation);
+        }
+    }
+
+    private int getFontHeight() {
+        if (fontHeight == 0) {
+            FontMetrics fontMetrics = getFontMetrics(getFont());
+            fontHeight = fontMetrics.getHeight();
+        }
+        return fontHeight;
+    }
+
+    // see javax.swing.JTextArea#getColumnWidth()
+    private int getCharWidth() {
+        if (charWidth == 0) {
+            FontMetrics fontMetrics = getFontMetrics(getFont());
+            charWidth = fontMetrics.charWidth('m');
+        }
+        return charWidth;
+    }
+}