Revert 86065 - Move sorting logic from table to list.

chrome/browser/resources/shared/js/cr/ui/list_selection_model.js

Index: chrome/browser/resources/shared/js/cr/ui/list_selection_model.js
===================================================================
--- chrome/browser/resources/shared/js/cr/ui/list_selection_model.js	(revision 86337)
+++ chrome/browser/resources/shared/js/cr/ui/list_selection_model.js	(working copy)
@@ -247,29 +247,43 @@
      * @param {!Array.<number>} permutation The reordering permutation.
      */
     adjustToReordering: function(permutation) {
-      var oldLeadIndex = this.leadIndex;
-
-      var oldSelectedIndexes = this.selectedIndexes;
-      this.selectedIndexes = oldSelectedIndexes.map(function(oldIndex) {
-        return permutation[oldIndex];
-      }).filter(function(index) {
-        return index != -1;
-      });
-
-      if (oldLeadIndex != -1)
-        this.leadIndex = permutation[oldLeadIndex];
     },
 
     /**
-     * Adjusts selection model length. This is only used when data model is
-     * set, so it is safe to clear() first.
-     * This should not be used for dataModel updates, use adjustToReordering
-     * instead.
-     * @param {number} length New selection model length.
+     * Adjust the selection by adding or removing a certain numbers of items.
+     * This should be called by the owner of the selection model as items are
+     * added and removed from the underlying data model.
+     * @param {number} index The index of the first change.
+     * @param {number} itemsRemoved Number of items removed.
+     * @param {number} itemsAdded Number of items added.
      */
-    adjustLength: function(length) {
-      this.clear();
-      this.length_ = length;
+    adjust: function(index, itemsRemoved, itemsAdded) {
+      function getNewAdjustedIndex(i) {
+        if (i >= index && i < index + itemsRemoved) {
+          return index
+        } else if (i >= index) {
+          return i - itemsRemoved + itemsAdded;
+        }
+        return i;
+      }
+
+      this.length_ += itemsAdded - itemsRemoved;
+
+      var newMap = [];
+      for (var i in this.selectedIndexes_) {
+        i = Number(i);
+        if (i < index) {
+          newMap[i] = true;
+        } else if (i < index + itemsRemoved) {
+          // noop
+        } else {
+          newMap[i + itemsAdded - itemsRemoved] = true;
+        }
+      }
+      this.selectedIndexes_ = newMap;
+
+      this.leadIndex = getNewAdjustedIndex(this.leadIndex);
+      this.anchorIndex = getNewAdjustedIndex(this.anchorIndex);
     }
   };