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diff --git a/src/blockly/core/rendered_connection.js b/src/blockly/core/rendered_connection.js
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+/**
+ * @license
+ * Visual Blocks Editor
+ *
+ * Copyright 2016 Google Inc.
+ * https://developers.google.com/blockly/
+ *
+ * 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.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @fileoverview Components for creating connections between blocks.
+ * @author fenichel@google.com (Rachel Fenichel)
+ */
+'use strict';
+
+goog.provide('Blockly.RenderedConnection');
+
+goog.require('Blockly.Connection');
+
+
+/**
+ * Class for a connection between blocks that may be rendered on screen.
+ * @param {!Blockly.Block} source The block establishing this connection.
+ * @param {number} type The type of the connection.
+ * @extends {Blockly.Connection}
+ * @constructor
+ */
+Blockly.RenderedConnection = function(source, type) {
+  Blockly.RenderedConnection.superClass_.constructor.call(this, source, type);
+  this.offsetInBlock_ = new goog.math.Coordinate(0, 0);
+};
+goog.inherits(Blockly.RenderedConnection, Blockly.Connection);
+
+/**
+ * Returns the distance between this connection and another connection.
+ * @param {!Blockly.Connection} otherConnection The other connection to measure
+ *     the distance to.
+ * @return {number} The distance between connections.
+ */
+Blockly.RenderedConnection.prototype.distanceFrom = function(otherConnection) {
+  var xDiff = this.x_ - otherConnection.x_;
+  var yDiff = this.y_ - otherConnection.y_;
+  return Math.sqrt(xDiff * xDiff + yDiff * yDiff);
+};
+
+/**
+ * Move the block(s) belonging to the connection to a point where they don't
+ * visually interfere with the specified connection.
+ * @param {!Blockly.Connection} staticConnection The connection to move away
+ *     from.
+ * @private
+ */
+Blockly.RenderedConnection.prototype.bumpAwayFrom_ = function(staticConnection) {
+  if (Blockly.dragMode_ != Blockly.DRAG_NONE) {
+    // Don't move blocks around while the user is doing the same.
+    return;
+  }
+  // Move the root block.
+  var rootBlock = this.sourceBlock_.getRootBlock();
+  if (rootBlock.isInFlyout) {
+    // Don't move blocks around in a flyout.
+    return;
+  }
+  var reverse = false;
+  if (!rootBlock.isMovable()) {
+    // Can't bump an uneditable block away.
+    // Check to see if the other block is movable.
+    rootBlock = staticConnection.getSourceBlock().getRootBlock();
+    if (!rootBlock.isMovable()) {
+      return;
+    }
+    // Swap the connections and move the 'static' connection instead.
+    staticConnection = this;
+    reverse = true;
+  }
+  // Raise it to the top for extra visibility.
+  var selected = Blockly.selected == rootBlock;
+  selected || rootBlock.addSelect();
+  var dx = (staticConnection.x_ + Blockly.SNAP_RADIUS) - this.x_;
+  var dy = (staticConnection.y_ + Blockly.SNAP_RADIUS) - this.y_;
+  if (reverse) {
+    // When reversing a bump due to an uneditable block, bump up.
+    dy = -dy;
+  }
+  if (rootBlock.RTL) {
+    dx = -dx;
+  }
+  rootBlock.moveBy(dx, dy);
+  selected || rootBlock.removeSelect();
+};
+
+/**
+ * Change the connection's coordinates.
+ * @param {number} x New absolute x coordinate.
+ * @param {number} y New absolute y coordinate.
+ */
+Blockly.RenderedConnection.prototype.moveTo = function(x, y) {
+  // Remove it from its old location in the database (if already present)
+  if (this.inDB_) {
+    this.db_.removeConnection_(this);
+  }
+  this.x_ = x;
+  this.y_ = y;
+  // Insert it into its new location in the database.
+  if (!this.hidden_) {
+    this.db_.addConnection(this);
+  }
+};
+
+/**
+ * Change the connection's coordinates.
+ * @param {number} dx Change to x coordinate.
+ * @param {number} dy Change to y coordinate.
+ */
+Blockly.RenderedConnection.prototype.moveBy = function(dx, dy) {
+  this.moveTo(this.x_ + dx, this.y_ + dy);
+};
+
+/**
+ * Move this connection to the location given by its offset within the block and
+ * the coordinate of the block's top left corner.
+ * @param {!goog.math.Coordinate} blockTL The coordinate of the top left corner
+ *     of the block.
+ */
+Blockly.RenderedConnection.prototype.moveToOffset = function(blockTL) {
+  this.moveTo(blockTL.x + this.offsetInBlock_.x,
+      blockTL.y + this.offsetInBlock_.y);
+};
+
+/**
+ * Set the offset of this connection relative to the top left of its block.
+ * @param {number} x The new relative x.
+ * @param {number} y The new relative y.
+ */
+Blockly.RenderedConnection.prototype.setOffsetInBlock = function(x, y) {
+  this.offsetInBlock_.x = x;
+  this.offsetInBlock_.y = y;
+};
+
+/**
+ * Move the blocks on either side of this connection right next to each other.
+ * @private
+ */
+Blockly.RenderedConnection.prototype.tighten_ = function() {
+  var dx = this.targetConnection.x_ - this.x_;
+  var dy = this.targetConnection.y_ - this.y_;
+  if (dx != 0 || dy != 0) {
+    var block = this.targetBlock();
+    var svgRoot = block.getSvgRoot();
+    if (!svgRoot) {
+      throw 'block is not rendered.';
+    }
+    var xy = Blockly.getRelativeXY_(svgRoot);
+    block.getSvgRoot().setAttribute('transform',
+        'translate(' + (xy.x - dx) + ',' + (xy.y - dy) + ')');
+    block.moveConnections_(-dx, -dy);
+  }
+};
+
+/**
+ * Find the closest compatible connection to this connection.
+ * @param {number} maxLimit The maximum radius to another connection.
+ * @param {number} dx Horizontal offset between this connection's location
+ *     in the database and the current location (as a result of dragging).
+ * @param {number} dy Vertical offset between this connection's location
+ *     in the database and the current location (as a result of dragging).
+ * @return {!{connection: ?Blockly.Connection, radius: number}} Contains two
+ *     properties: 'connection' which is either another connection or null,
+ *     and 'radius' which is the distance.
+ */
+Blockly.RenderedConnection.prototype.closest = function(maxLimit, dx, dy) {
+  return this.dbOpposite_.searchForClosest(this, maxLimit, dx, dy);
+};
+
+/**
+ * Add highlighting around this connection.
+ */
+Blockly.RenderedConnection.prototype.highlight = function() {
+  var steps;
+  if (this.type == Blockly.INPUT_VALUE || this.type == Blockly.OUTPUT_VALUE) {
+    steps = 'm 0,0 ' + Blockly.BlockSvg.TAB_PATH_DOWN + ' v 5';
+  } else {
+    steps = 'm -20,0 h 5 ' + Blockly.BlockSvg.NOTCH_PATH_LEFT + ' h 5';
+  }
+  var xy = this.sourceBlock_.getRelativeToSurfaceXY();
+  var x = this.x_ - xy.x;
+  var y = this.y_ - xy.y;
+  Blockly.Connection.highlightedPath_ = Blockly.createSvgElement('path',
+      {'class': 'blocklyHighlightedConnectionPath',
+       'd': steps,
+       transform: 'translate(' + x + ',' + y + ')' +
+           (this.sourceBlock_.RTL ? ' scale(-1 1)' : '')},
+      this.sourceBlock_.getSvgRoot());
+};
+
+/**
+ * Unhide this connection, as well as all down-stream connections on any block
+ * attached to this connection.  This happens when a block is expanded.
+ * Also unhides down-stream comments.
+ * @return {!Array.<!Blockly.Block>} List of blocks to render.
+ */
+Blockly.RenderedConnection.prototype.unhideAll = function() {
+  this.setHidden(false);
+  // All blocks that need unhiding must be unhidden before any rendering takes
+  // place, since rendering requires knowing the dimensions of lower blocks.
+  // Also, since rendering a block renders all its parents, we only need to
+  // render the leaf nodes.
+  var renderList = [];
+  if (this.type != Blockly.INPUT_VALUE && this.type != Blockly.NEXT_STATEMENT) {
+    // Only spider down.
+    return renderList;
+  }
+  var block = this.targetBlock();
+  if (block) {
+    var connections;
+    if (block.isCollapsed()) {
+      // This block should only be partially revealed since it is collapsed.
+      connections = [];
+      block.outputConnection && connections.push(block.outputConnection);
+      block.nextConnection && connections.push(block.nextConnection);
+      block.previousConnection && connections.push(block.previousConnection);
+    } else {
+      // Show all connections of this block.
+      connections = block.getConnections_(true);
+    }
+    for (var i = 0; i < connections.length; i++) {
+      renderList.push.apply(renderList, connections[i].unhideAll());
+    }
+    if (!renderList.length) {
+      // Leaf block.
+      renderList[0] = block;
+    }
+  }
+  return renderList;
+};
+
+/**
+ * Remove the highlighting around this connection.
+ */
+Blockly.RenderedConnection.prototype.unhighlight = function() {
+  goog.dom.removeNode(Blockly.Connection.highlightedPath_);
+  delete Blockly.Connection.highlightedPath_;
+};
+
+/**
+ * Set whether this connections is hidden (not tracked in a database) or not.
+ * @param {boolean} hidden True if connection is hidden.
+ */
+Blockly.RenderedConnection.prototype.setHidden = function(hidden) {
+  this.hidden_ = hidden;
+  if (hidden && this.inDB_) {
+    this.db_.removeConnection_(this);
+  } else if (!hidden && !this.inDB_) {
+    this.db_.addConnection(this);
+  }
+};
+
+/**
+ * Hide this connection, as well as all down-stream connections on any block
+ * attached to this connection.  This happens when a block is collapsed.
+ * Also hides down-stream comments.
+ */
+Blockly.RenderedConnection.prototype.hideAll = function() {
+  this.setHidden(true);
+  if (this.targetConnection) {
+    var blocks = this.targetBlock().getDescendants();
+    for (var i = 0; i < blocks.length; i++) {
+      var block = blocks[i];
+      // Hide all connections of all children.
+      var connections = block.getConnections_(true);
+      for (var j = 0; j < connections.length; j++) {
+        connections[j].setHidden(true);
+      }
+      // Close all bubbles of all children.
+      var icons = block.getIcons();
+      for (var j = 0; j < icons.length; j++) {
+        icons[j].setVisible(false);
+      }
+    }
+  }
+};
+
+/**
+ * Check if the two connections can be dragged to connect to each other.
+ * @param {!Blockly.Connection} candidate A nearby connection to check.
+ * @param {number} maxRadius The maximum radius allowed for connections.
+ * @return {boolean} True if the connection is allowed, false otherwise.
+ */
+Blockly.RenderedConnection.prototype.isConnectionAllowed = function(candidate,
+    maxRadius) {
+  if (this.distanceFrom(candidate) > maxRadius) {
+    return false;
+  }
+
+  return Blockly.RenderedConnection.superClass_.isConnectionAllowed.call(this,
+      candidate);
+};
+
+/**
+ * Disconnect two blocks that are connected by this connection.
+ * @param {!Blockly.Block} parentBlock The superior block.
+ * @param {!Blockly.Block} childBlock The inferior block.
+ * @private
+ */
+Blockly.RenderedConnection.prototype.disconnectInternal_ = function(parentBlock,
+    childBlock) {
+  Blockly.RenderedConnection.superClass_.disconnectInternal_.call(this,
+      parentBlock, childBlock);
+  // Rerender the parent so that it may reflow.
+  if (parentBlock.rendered) {
+    parentBlock.render();
+  }
+  if (childBlock.rendered) {
+    childBlock.updateDisabled();
+    childBlock.render();
+  }
+};
+
+/**
+ * Respawn the shadow block if there was one connected to the this connection.
+ * Render/rerender blocks as needed.
+ * @private
+ */
+Blockly.RenderedConnection.prototype.respawnShadow_ = function() {
+  var parentBlock = this.getSourceBlock();
+  // Respawn the shadow block if there is one.
+  var shadow = this.getShadowDom();
+  if (parentBlock.workspace && shadow && Blockly.Events.recordUndo) {
+    Blockly.RenderedConnection.superClass_.respawnShadow_.call(this);
+    var blockShadow = this.targetBlock();
+    if (!blockShadow) {
+      throw 'Couldn\'t respawn the shadow block that should exist here.';
+    }
+    blockShadow.initSvg();
+    blockShadow.render(false);
+    if (parentBlock.rendered) {
+      parentBlock.render();
+    }
+  }
+};
+
+/**
+ * Find all nearby compatible connections to this connection.
+ * Type checking does not apply, since this function is used for bumping.
+ * @param {number} maxLimit The maximum radius to another connection.
+ * @return {!Array.<!Blockly.Connection>} List of connections.
+ * @private
+ */
+Blockly.RenderedConnection.prototype.neighbours_ = function(maxLimit) {
+  return this.dbOpposite_.getNeighbours(this, maxLimit);
+};
+
+/**
+ * Connect two connections together.  This is the connection on the superior
+ * block.  Rerender blocks as needed.
+ * @param {!Blockly.Connection} childConnection Connection on inferior block.
+ * @private
+ */
+Blockly.RenderedConnection.prototype.connect_ = function(childConnection) {
+  Blockly.RenderedConnection.superClass_.connect_.call(this, childConnection);
+
+  var parentConnection = this;
+  var parentBlock = parentConnection.getSourceBlock();
+  var childBlock = childConnection.getSourceBlock();
+
+  if (parentBlock.rendered) {
+    parentBlock.updateDisabled();
+  }
+  if (childBlock.rendered) {
+    childBlock.updateDisabled();
+  }
+  if (parentBlock.rendered && childBlock.rendered) {
+    if (parentConnection.type == Blockly.NEXT_STATEMENT ||
+        parentConnection.type == Blockly.PREVIOUS_STATEMENT) {
+      // Child block may need to square off its corners if it is in a stack.
+      // Rendering a child will render its parent.
+      childBlock.render();
+    } else {
+      // Child block does not change shape.  Rendering the parent node will
+      // move its connected children into position.
+      parentBlock.render();
+    }
+  }
+};