Index: applications/editors/josm/plugins/mapillary/src/org/openstreetmap/josm/plugins/mapillary/MapillaryPlugin.java
===================================================================
--- applications/editors/josm/plugins/mapillary/src/org/openstreetmap/josm/plugins/mapillary/MapillaryPlugin.java	(revision 32576)
+++ applications/editors/josm/plugins/mapillary/src/org/openstreetmap/josm/plugins/mapillary/MapillaryPlugin.java	(revision 32577)
@@ -27,4 +27,5 @@
 import org.openstreetmap.josm.plugins.mapillary.actions.MapillaryWalkAction;
 import org.openstreetmap.josm.plugins.mapillary.actions.MapillaryZoomAction;
+import org.openstreetmap.josm.plugins.mapillary.gui.MapillaryChangesetDialog;
 import org.openstreetmap.josm.plugins.mapillary.gui.MapillaryFilterDialog;
 import org.openstreetmap.josm.plugins.mapillary.gui.MapillaryHistoryDialog;
@@ -219,4 +220,7 @@
       Main.map.addToggleDialog(MapillaryMainDialog.getInstance(), false);
       Main.map.addToggleDialog(MapillaryHistoryDialog.getInstance(), false);
+      if (Main.pref.getBoolean("mapillary.developer")) {
+        Main.map.addToggleDialog(MapillaryChangesetDialog.getInstance(), false);
+      }
       Main.map.addToggleDialog(MapillaryFilterDialog.getInstance(), false);
       setMenuEnabled(downloadMenu, true);
@@ -229,4 +233,5 @@
       MapillaryMainDialog.destroyInstance();
       MapillaryHistoryDialog.destroyInstance();
+      MapillaryChangesetDialog.destroyInstance();
       MapillaryFilterDialog.destroyInstance();
       setMenuEnabled(downloadMenu, false);
Index: applications/editors/josm/plugins/mapillary/src/org/openstreetmap/josm/plugins/mapillary/gui/MapillaryChangesetDialog.java
===================================================================
--- applications/editors/josm/plugins/mapillary/src/org/openstreetmap/josm/plugins/mapillary/gui/MapillaryChangesetDialog.java	(revision 32577)
+++ applications/editors/josm/plugins/mapillary/src/org/openstreetmap/josm/plugins/mapillary/gui/MapillaryChangesetDialog.java	(revision 32577)
@@ -0,0 +1,183 @@
+// License: GPL. For details, see LICENSE file.
+package org.openstreetmap.josm.plugins.mapillary.gui;
+
+import static org.openstreetmap.josm.tools.I18n.tr;
+
+import java.awt.Component;
+import java.awt.Dimension;
+import java.awt.GridBagConstraints;
+import java.awt.GridBagLayout;
+import java.awt.event.ActionEvent;
+import java.awt.event.KeyEvent;
+import java.util.Arrays;
+import java.util.concurrent.ConcurrentHashMap;
+
+import javax.swing.AbstractAction;
+import javax.swing.Box;
+import javax.swing.JPanel;
+import javax.swing.JSeparator;
+import javax.swing.JTree;
+import javax.swing.SwingUtilities;
+import javax.swing.tree.DefaultMutableTreeNode;
+import javax.swing.tree.DefaultTreeCellRenderer;
+import javax.swing.tree.DefaultTreeModel;
+import javax.swing.tree.TreeSelectionModel;
+
+import org.openstreetmap.josm.gui.SideButton;
+import org.openstreetmap.josm.gui.dialogs.ToggleDialog;
+import org.openstreetmap.josm.plugins.mapillary.MapillaryAbstractImage;
+import org.openstreetmap.josm.plugins.mapillary.MapillaryImage;
+import org.openstreetmap.josm.plugins.mapillary.MapillaryLayer;
+import org.openstreetmap.josm.plugins.mapillary.MapillaryLocationChangeset;
+import org.openstreetmap.josm.plugins.mapillary.actions.MapillarySubmitCurrentChangesetAction;
+import org.openstreetmap.josm.plugins.mapillary.history.MapillaryRecord;
+import org.openstreetmap.josm.plugins.mapillary.history.commands.MapillaryCommand;
+import org.openstreetmap.josm.plugins.mapillary.utils.MapillaryChangesetListener;
+import org.openstreetmap.josm.tools.GBC;
+import org.openstreetmap.josm.tools.ImageProvider;
+import org.openstreetmap.josm.tools.Shortcut;
+
+/**
+ * Toggle dialog that shows you the latest {@link MapillaryCommand} done and
+ * allows the user to revert them.
+ *
+ * @see MapillaryRecord
+ * @see MapillaryCommand
+ */
+public final class MapillaryChangesetDialog extends ToggleDialog implements MapillaryChangesetListener {
+
+  private static final long serialVersionUID = -3019715241209349372L;
+
+  private static MapillaryChangesetDialog instance;
+
+  private final DefaultTreeModel changesetTreeModel = new DefaultTreeModel(new DefaultMutableTreeNode());
+  private final JTree changesetTree = new JTree(this.changesetTreeModel);
+
+  private final JSeparator separator = new JSeparator();
+  private final Component spacer = Box.createRigidArea(new Dimension(0, 3));
+
+  private final SideButton submitButton;
+
+  private final ConcurrentHashMap<Object, MapillaryAbstractImage> map;
+
+  /**
+   * Destroys the unique instance of the class.
+   */
+  public static void destroyInstance() {
+    MapillaryChangesetDialog.instance = null;
+  }
+
+  private MapillaryChangesetDialog() {
+    super(
+      tr("Current Mapillary changeset"), "mapillaryhistory.png", tr("Open Mapillary changeset dialog"),
+      Shortcut.registerShortcut(
+        tr("Mapillary changeset"), tr("Open Mapillary changeset dialog"), KeyEvent.VK_9, Shortcut.NONE
+      ), 200
+    );
+
+    MapillaryLayer.getInstance().getLocationChangeset().addChangesetListener(this);
+    this.map = new ConcurrentHashMap<>();
+
+    this.changesetTree.expandRow(0);
+    this.changesetTree.setShowsRootHandles(true);
+    this.changesetTree.setRootVisible(false);
+    this.changesetTree.setCellRenderer(new MapillaryCellRenderer());
+    this.changesetTree.getSelectionModel().setSelectionMode(TreeSelectionModel.SINGLE_TREE_SELECTION);
+
+    JPanel treesPanel = new JPanel(new GridBagLayout());
+    treesPanel.add(this.spacer, GBC.eol());
+    this.spacer.setVisible(false);
+    treesPanel.add(this.changesetTree, GBC.eol().fill(GridBagConstraints.HORIZONTAL));
+    this.separator.setVisible(false);
+    treesPanel.add(this.separator, GBC.eol().fill(GridBagConstraints.HORIZONTAL));
+    treesPanel.add(Box.createRigidArea(new Dimension(0, 0)), GBC.std().weight(0, 1));
+
+    this.submitButton = new SideButton(new SubmitAction());
+
+    createLayout(treesPanel, true, Arrays.asList(new SideButton[] { this.submitButton }));
+    buildTree();
+  }
+
+  /**
+   * Returns the unique instance of the class.
+   *
+   * @return The unique instance of the class.
+   */
+  public static synchronized MapillaryChangesetDialog getInstance() {
+    if (instance == null)
+      instance = new MapillaryChangesetDialog();
+    return instance;
+  }
+
+  private void buildTree() {
+    this.submitButton.setEnabled(true);
+    MapillaryLocationChangeset changeset = MapillaryLayer.getInstance().getLocationChangeset();
+    if (!changeset.isEmpty()) {
+      this.submitButton.setEnabled(true);
+    } else {
+      this.submitButton.setEnabled(false);
+    }
+    DefaultMutableTreeNode changesetRoot = new DefaultMutableTreeNode();
+
+    this.map.clear();
+    for (MapillaryImage command : changeset) {
+      if (command != null) {
+        DefaultMutableTreeNode node = new DefaultMutableTreeNode(command.toString());
+        this.map.put(node, command);
+        changesetRoot.add(node);
+      }
+    }
+
+    this.spacer.setVisible(changeset.isEmpty());
+
+    this.changesetTreeModel.setRoot(changesetRoot);
+  }
+
+  @Override
+  public void changesetChanged() {
+    if (!SwingUtilities.isEventDispatchThread()) {
+      SwingUtilities.invokeLater(
+        new Runnable() {
+          @Override
+          public void run() {
+            buildTree();
+          }
+        }
+      );
+    } else {
+      buildTree();
+    }
+
+  }
+
+  private class SubmitAction extends AbstractAction {
+
+    private static final long serialVersionUID = -2761935780353053512L;
+
+    SubmitAction() {
+      putValue(NAME, tr("Submit"));
+      putValue(SMALL_ICON, ImageProvider.get("upload"));
+    }
+
+    @Override
+    public void actionPerformed(ActionEvent arg0) {
+      MapillarySubmitCurrentChangesetAction submitCurrentChangesetAction = new MapillarySubmitCurrentChangesetAction();
+      submitCurrentChangesetAction.actionPerformed(null);
+    }
+  }
+
+  private static class MapillaryCellRenderer extends DefaultTreeCellRenderer {
+
+    private static final long serialVersionUID = -3129520241562296901L;
+
+    @Override
+    public Component getTreeCellRendererComponent(
+      JTree tree, Object value, boolean sel, boolean expanded, boolean leaf, int row, boolean hasFocus
+    ) {
+      super.getTreeCellRendererComponent(tree, value, sel, expanded, leaf, row, hasFocus);
+      setIcon(ImageProvider.get("data/node.png"));
+      return this;
+    }
+  }
+
+}