Merge branch 'master' of github.com:danvk/dygraphs

diff --combined dygraph.js
index 90112cf,41ad05c..ba6889e
--- 1/dygraph.js
--- 2/dygraph.js
+++ b/dygraph.js
@@@ -409,7 -409,6 +409,7 @@@ Dygraph.prototype.__init__ = function(d
    this.datasetIndex_ = [];
  
    this.registeredEvents_ = [];
 +  this.eventListeners_ = {};
  
    // Create the containing DIV and other interactive elements
    this.createInterface_();
@@@ -437,6 -436,7 +437,6 @@@
  
    // At this point, plugins can no longer register event handlers.
    // Construct a map from event -> ordered list of [callback, plugin].
 -  this.eventListeners_ = {};
    for (var i = 0; i < this.plugins_.length; i++) {
      var plugin_dict = this.plugins_[i];
      for (var eventName in plugin_dict.events) {
@@@ -931,6 -931,7 +931,6 @@@ Dygraph.prototype.createInterface_ = fu
    if (this.attr_('showRangeSelector')) {
      // The range selector must be created here so that its canvases and contexts get created here.
      // For some reason, if the canvases and contexts don't get created here, things don't work in IE.
 -    // The range selector also sets xAxisHeight in order to reserve space.
      this.rangeSelector_ = new DygraphRangeSelector(this);
    }
  
@@@ -948,12 -949,12 +948,12 @@@
    }
  
    var dygraph = this;
 -  
 +
    this.mouseMoveHandler = function(e) {
      dygraph.mouseMove_(e);
    };
    this.addEvent(this.mouseEventElement_, 'mousemove', this.mouseMoveHandler);
 -  
 +
    this.mouseOutHandler = function(e) {
      dygraph.mouseOut_(e);
    };
@@@ -982,7 -983,7 +982,7 @@@ Dygraph.prototype.destroy = function() 
        node.removeChild(node.firstChild);
      }
    };
 - 
 +
    for (var idx = 0; idx < this.registeredEvents_.length; idx++) {
      var reg = this.registeredEvents_[idx];
      Dygraph.removeEvent(reg.elem, reg.type, reg.fn);
@@@ -1734,7 -1735,7 +1734,7 @@@ Dygraph.prototype.mouseMove_ = function
  
    var highlightSeriesOpts = this.attr_("highlightSeriesOpts");
    var selectionChanged = false;
-   if (highlightSeriesOpts) {
+   if (highlightSeriesOpts && !this.lockedSet_) {
      var closest;
      if (this.attr_("stackedGraph")) {
        closest = this.findStackedPoint(canvasx, canvasy);
@@@ -1905,8 -1906,11 +1905,11 @@@ Dygraph.prototype.updateSelection_ = fu
   * hover dots on the chart). Set to false to clear any selection.
   * @param { seriesName } optional series name to highlight that series with the
   * the highlightSeriesOpts setting.
+  * @param { locked } optional If true, keep seriesName selected when mousing
+  * over the graph, disabling closest-series highlighting. Call clearSelection()
+  * to unlock it.
   */
- Dygraph.prototype.setSelection = function(row, opt_seriesName) {
+ Dygraph.prototype.setSelection = function(row, opt_seriesName, opt_locked) {
    // Extract the points we've selected
    this.selPoints_ = [];
  
@@@ -1946,6 -1950,10 +1949,10 @@@
      this.highlightSet_ = opt_seriesName;
    }
  
+   if (opt_locked !== undefined) {
+     this.lockedSet_ = opt_locked;
+   }
+ 
    if (changed) {
      this.updateSelection_(undefined);
    }
@@@ -1962,7 -1970,7 +1969,7 @@@ Dygraph.prototype.mouseOut_ = function(
      this.attr_("unhighlightCallback")(event);
    }
  
-   if (this.attr_("hideOverlayOnMouseOut")) {
+   if (this.attr_("hideOverlayOnMouseOut") && !this.lockedSet_) {
      this.clearSelection();
    }
  };
@@@ -1974,6 -1982,7 +1981,7 @@@
  Dygraph.prototype.clearSelection = function() {
    this.cascadeEvents_('deselect', {});
  
+   this.lockedSet_ = false;
    // Get rid of the overlay data
    if (this.fadeLevel) {
      this.animateSelection_(-1);
@@@ -2641,7 -2650,7 +2649,7 @@@ Dygraph.prototype.computeYAxisRanges_ 
   * This is where undesirable points (i.e. negative values on log scales and
   * missing values through which we wish to connect lines) are dropped.
   * TODO(danvk): the "missing values" bit above doesn't seem right.
 - * 
 + *
   * @private
   */
  Dygraph.prototype.extractSeries_ = function(rawData, i, logScale) {