Fix responsiveness issue when selecting features on iPad

Implement an alternative solution for #6028 that doesn't rely on timeouts

modules/ui/entity_editor.js

@@ -166,11 +166,12 @@ export function uiEntityEditor(context) {
 
     // Tag changes that fire on input can all get coalesced into a single
     // history operation when the user leaves the field.  #2342
-    function changeTags(changed, onInput) {
+    // Use explicit entityIDs in case the selection changes before the event is fired.
+    function changeTags(entityIDs, changed, onInput) {
 
         var actions = [];
-        for (var i in _entityIDs) {
-            var entityID = _entityIDs[i];
+        for (var i in entityIDs) {
+            var entityID = entityIDs[i];
             var entity = context.entity(entityID);
 
             var tags = Object.assign({}, entity.tags);   // shallow copy

modules/ui/sections/preset_fields.js

@@ -100,7 +100,7 @@ export function uiSectionPresetFields(context) {
             _fieldsArr.forEach(function(field) {
                 field
                     .on('change', function(t, onInput) {
-                        dispatch.call('change', field, t, onInput);
+                        dispatch.call('change', field, _entityIDs, t, onInput);
                     })
                     .on('revert', function(keys) {
                         dispatch.call('revert', field, keys);

modules/ui/sections/raw_tag_editor.js

@@ -553,9 +553,14 @@ export function uiSectionRawTagEditor(id, context) {
     }
 
     function scheduleChange() {
+        // Cache IDs in case the editor is reloaded before the change event is called. - #6028
+        var entityIDs = _entityIDs;
+
         // Delay change in case this change is blurring an edited combo. - #5878
         window.setTimeout(function() {
-            dispatch.call('change', this, _pendingChange);
+            if (!_pendingChange) return;
+
+            dispatch.call('change', this, entityIDs, _pendingChange);
             _pendingChange = null;
         }, 10);
     }