fix(modeling): skip moving if label is not yet created.

Related to https://github.com/zeebe-io/zeebe-modeler/issues/134

lib/features/modeling/behavior/LabelBehavior.js

@@ -212,7 +212,12 @@ export default function LabelBehavior(
     var label = event.context.connection.label,
         labelAdjustment;
 
-    if (!label) {
+    // handle missing label as well as the case
+    // that the label parent does not exist (yet),
+    // because it is being pasted / created via multi element create
+    //
+    // Cf. https://github.com/bpmn-io/bpmn-js/pull/1227
+    if (!label || !label.parent) {
       return;
     }
 
@@ -386,4 +391,4 @@ function getNearestLine(point, lines) {
   var sorted = sortBy(distances, 'distance');
 
   return sorted[0].line;
-}
+}

test/spec/features/modeling/behavior/LabelBehavior.copyPaste.bpmn

@@ -0,0 +1,31 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<bpmn:definitions xmlns:bpmn="http://www.omg.org/spec/BPMN/20100524/MODEL" xmlns:bpmndi="http://www.omg.org/spec/BPMN/20100524/DI" xmlns:dc="http://www.omg.org/spec/DD/20100524/DC" xmlns:di="http://www.omg.org/spec/DD/20100524/DI" id="Definitions_0cu5n0d" targetNamespace="http://bpmn.io/schema/bpmn" exporter="Camunda Modeler" exporterVersion="3.4.0">
+  <bpmn:process id="Process_1cirp64" isExecutable="true">
+    <bpmn:startEvent id="Source">
+      <bpmn:outgoing>SequenceFlow</bpmn:outgoing>
+    </bpmn:startEvent>
+    <bpmn:task id="Target">
+      <bpmn:incoming>SequenceFlow</bpmn:incoming>
+    </bpmn:task>
+    <bpmn:sequenceFlow id="SequenceFlow" name="A" sourceRef="Source" targetRef="Target" />
+  </bpmn:process>
+  <bpmndi:BPMNDiagram id="BPMNDiagram_1">
+    <bpmndi:BPMNPlane id="BPMNPlane_1" bpmnElement="Process_1cirp64">
+      <bpmndi:BPMNShape id="_BPMNShape_StartEvent_2" bpmnElement="Source">
+        <dc:Bounds x="179" y="79" width="36" height="36" />
+      </bpmndi:BPMNShape>
+      <bpmndi:BPMNShape id="Task_1m56bsl_di" bpmnElement="Target">
+        <dc:Bounds x="300" y="250" width="100" height="80" />
+      </bpmndi:BPMNShape>
+      <bpmndi:BPMNEdge id="SequenceFlow_di" bpmnElement="SequenceFlow">
+        <di:waypoint x="215" y="97" />
+        <di:waypoint x="258" y="97" />
+        <di:waypoint x="258" y="290" />
+        <di:waypoint x="300" y="290" />
+        <bpmndi:BPMNLabel>
+          <dc:Bounds x="270" y="191" width="7" height="14" />
+        </bpmndi:BPMNLabel>
+      </bpmndi:BPMNEdge>
+    </bpmndi:BPMNPlane>
+  </bpmndi:BPMNDiagram>
+</bpmn:definitions>

test/spec/features/modeling/behavior/LabelBehaviorSpec.js

@@ -15,15 +15,19 @@ import {
 
 import modelingModule from 'lib/features/modeling';
 import coreModule from 'lib/core';
+import gridSnappingModule from 'lib/features/grid-snapping';
 
 
 describe('behavior - LabelBehavior', function() {
 
   var diagramXML = require('./LabelBehavior.bpmn');
 
-  var testModules = [ modelingModule, coreModule ];
-
-  beforeEach(bootstrapModeler(diagramXML, { modules: testModules }));
+  beforeEach(bootstrapModeler(diagramXML, {
+    modules: [
+      modelingModule,
+      coreModule
+    ]
+  }));
 
 
   describe('updating name property', function() {
@@ -669,6 +673,59 @@ describe('behavior - LabelBehavior', function() {
 
 });
 
+
+describe('behavior - LabelBehavior', function() {
+
+  describe('copy/paste integration', function() {
+
+    var diagramXML = require('./LabelBehavior.copyPaste.bpmn');
+
+    beforeEach(bootstrapModeler(diagramXML, {
+      modules: [
+        modelingModule,
+        coreModule,
+        gridSnappingModule
+      ]
+    }));
+
+
+    it('should skip adjustment during creation', inject(
+      function(elementRegistry, copyPaste, canvas, dragging) {
+
+        // given
+        var elements = [
+          elementRegistry.get('Source'),
+          elementRegistry.get('Target'),
+          elementRegistry.get('SequenceFlow'),
+          elementRegistry.get('SequenceFlow').label
+        ];
+
+        var rootElement = canvas.getRootElement();
+
+        copyPaste.copy(elements);
+
+        // when
+        var pastedElements = copyPaste.paste({
+          element: rootElement,
+          point: {
+            x: 700,
+            y: 300
+          }
+        });
+
+        var label = pastedElements[3];
+
+        // then
+        expect(label).to.exist;
+
+        expect(label).to.have.position({ x: 681, y: 287 });
+      }
+    ));
+
+  });
+
+});
+
 // helpers //////////
 
 function getBounds(element) {