Do not fire modifyend event when nothing was modified

src/ol/interaction/Modify.js

@@ -1360,13 +1360,16 @@ class Modify extends PointerInteraction {
       const evt = this.lastPointerEvent_;
       this.willModifyFeatures_(evt, this.dragSegments_);
       const removed = this.removeVertex_();
-      this.dispatchEvent(
-        new ModifyEvent(
-          ModifyEventType.MODIFYEND,
-          this.featuresBeingModified_,
-          evt
-        )
-      );
+      if (this.featuresBeingModified_) {
+        this.dispatchEvent(
+          new ModifyEvent(
+            ModifyEventType.MODIFYEND,
+            this.featuresBeingModified_,
+            evt
+          )
+        );
+      }
+
       this.featuresBeingModified_ = null;
       return removed;
     }

test/browser/spec/ol/interaction/modify.test.js

@@ -20,7 +20,11 @@ import {
   clearUserProjection,
   setUserProjection,
 } from '../../../../../src/ol/proj.js';
-import {doubleClick, never} from '../../../../../src/ol/events/condition.js';
+import {
+  click,
+  doubleClick,
+  never,
+} from '../../../../../src/ol/events/condition.js';
 import {getValues} from '../../../../../src/ol/obj.js';
 
 describe('ol.interaction.Modify', function () {
@@ -880,6 +884,33 @@ describe('ol.interaction.Modify', function () {
         done();
       }, 0);
     });
+
+    it('does not fire `modifyend` when nothing is modified', function (done) {
+      const modify = new Modify({
+        features: new Collection(features),
+        deleteCondition: click,
+        insertVertexCondition: never,
+      });
+      map.addInteraction(modify);
+
+      let modifyend = false;
+      modify.on('modifyend', function (e) {
+        modifyend = true;
+      });
+
+      // try to add vertex
+      simulateEvent('pointermove', 40, -20, null, 0);
+      simulateEvent('pointerdown', 40, -20, null, 0);
+      simulateEvent('pointerdrag', 42, -30, null, 0);
+      simulateEvent('pointerup', 42, -30, null, 0);
+      simulateEvent('click', 42, -30, null, 0);
+      simulateEvent('singleclick', 42, -30, null, 0);
+
+      setTimeout(function () {
+        expect(modifyend).to.be(false);
+        done();
+      }, 0);
+    });
   });
 
   describe('handle feature change', function () {