Plug memory leak in raw tag editor / d3.combobox

js/id/ui/raw_tag_editor.js

@@ -114,6 +114,7 @@ iD.ui.RawTagEditor = function(context) {
             .on('click', removeTag);
 
         $items.exit()
+            .each(unbind)
             .remove();
 
         function pushMore() {
@@ -165,6 +166,16 @@ iD.ui.RawTagEditor = function(context) {
                 }));
         }
 
+        function unbind() {
+            var row = d3.select(this);
+
+            row.selectAll('input.key')
+                .call(d3.combobox.off);
+
+            row.selectAll('input.value')
+                .call(d3.combobox.off);
+        }
+
         function keyChange(d) {
             var kOld = d.key,
                 kNew = this.value.trim(),

js/lib/d3.combobox.js

@@ -271,3 +271,23 @@ d3.combobox = function() {
 
     return d3.rebind(combobox, event, 'on');
 };
+
+d3.combobox.off = function(input) {
+    data = null;
+    fetcher = null;
+
+    input
+        .on('focus.typeahead', null)
+        .on('blur.typeahead', null)
+        .on('keydown.typeahead', null)
+        .on('keyup.typeahead', null)
+        .on('input.typeahead', null)
+        .each(function() {
+            d3.select(this.parentNode).selectAll('.combobox-caret')
+                .filter(function(d) { return d === input.node(); })
+                .on('mousedown', null);
+        });
+
+    d3.select(document.body)
+        .on('scroll.combobox', null);
+};