diff --git a/src/main/services/patcher/patcher-saga.ts b/src/main/services/patcher/patcher-saga.ts
new file mode 100644
index 00000000..8df0aa16
--- /dev/null
+++ b/src/main/services/patcher/patcher-saga.ts
@@ -0,0 +1,47 @@
+import { call, debounce, delay, put, select, take } from 'redux-saga/effects';
+ import { SagaIterator } from 'redux-saga';
+
+ import { run } from '../../utils/actions/sagas';
+ import { PatcherActionTypes } from './patcher-types';
+ import { ModelState } from '../../components/store/model-state';
+ import { UMLContainerRepository } from '../uml-container/uml-container-repository';
+ import { UMLElement } from '../uml-element/uml-element';
+ import { UMLRelationship } from '../uml-relationship/uml-relationship';
+ import { recalc } from '../uml-relationship/uml-relationship-saga';
+ import { render } from '../layouter/layouter';
+
+ /**
+  * Fixes the layout of the diagram after importing a patch.
+  */
+ export function* PatchLayouter(): SagaIterator {
+  yield run([patchLayout]);
+}
+
+export function* patchLayout(): SagaIterator {
+  yield debounce(100, PatcherActionTypes.PATCH, recalculateLayouts);
+}
+
+function* recalculateLayouts(): SagaIterator {
+  const { elements }: ModelState = yield select();
+
+  const ids = Object.values(elements)
+    .filter((x) => !x.owner)
+    .map((x) => x.id);
+
+  if (!ids.length) {
+    return;
+  }
+
+  yield put(UMLContainerRepository.append(ids));
+
+  for (const id of Object.keys(elements)) {
+    yield delay(0);
+    if (UMLElement.isUMLElement(elements[id])) {
+      yield call(render, id);
+    }
+
+    if (UMLRelationship.isUMLRelationship(elements[id]) && !elements[id].isManuallyLayouted) {
+      yield call(recalc, id);
+    }
+  }
+}
diff --git a/src/main/services/saga.ts b/src/main/services/saga.ts
index 4037e4eb..5bbbb63e 100644
--- a/src/main/services/saga.ts
+++ b/src/main/services/saga.ts
@@ -6,11 +6,12 @@ import { UMLContainerSaga } from './uml-container/uml-container-saga';
 import { UMLDiagramSaga } from './uml-diagram/uml-diagram-saga';
 import { UMLElementSaga } from './uml-element/uml-element-saga';
 import { UMLRelationshipSaga } from './uml-relationship/uml-relationship-saga';
+import { PatchLayouter } from './patcher/patcher-saga';
 
 export type SagaContext = {
   layer: ILayer | null;
 };
 
 export function* saga(): SagaIterator {
-  yield composeSaga([Layouter, UMLElementSaga, UMLContainerSaga, UMLRelationshipSaga, UMLDiagramSaga]);
+  yield composeSaga([Layouter, UMLElementSaga, UMLContainerSaga, UMLRelationshipSaga, UMLDiagramSaga, PatchLayouter]);
 }
diff --git a/src/tests/unit/services/patcher/patcher-saga-test.ts b/src/tests/unit/services/patcher/patcher-saga-test.ts
new file mode 100644
index 00000000..383a9a7a
--- /dev/null
+++ b/src/tests/unit/services/patcher/patcher-saga-test.ts
@@ -0,0 +1,70 @@
+import { call, debounce, delay, select, take } from 'redux-saga/effects';
+
+ import { patchLayout } from '../../../../main/services/patcher/patcher-saga';
+ import { PatcherActionTypes, PatcherRepository } from '../../../../main/services/patcher';
+ import { UMLElementState } from '../../../../main/services/uml-element/uml-element-types';
+ import { IUMLRelationship } from '../../../../main/services/uml-relationship/uml-relationship';
+ import { render } from '../../../../main/services/layouter/layouter';
+ import { recalc } from '../../../../main/services/uml-relationship/uml-relationship-saga';
+
+ describe('test patcher saga.', () => {
+   test('it invokes re-renders and re-calcs after a patch.', () => {
+     const run = patchLayout();
+     const debounced = run.next().value;
+     expect(debounced).toEqual(debounce(100, PatcherActionTypes.PATCH, expect.any(Function)));
+
+     const fork = debounced['payload']['args'][2]();
+     expect(fork.next(PatcherRepository.patch([{ op: 'add', path: '/x', value: 42 }])).value).toEqual(select());
+
+     const elements: UMLElementState = {
+       x: {
+         type: 'Package',
+         id: 'x',
+         name: 'package',
+         owner: null,
+         bounds: { x: 0, y: 0, width: 100, height: 100 },
+       },
+       y: {
+         type: 'Class',
+         id: 'y',
+         name: 'class',
+         owner: 'x',
+         bounds: { x: 0, y: 0, width: 100, height: 100 },
+       },
+       z: {
+         type: 'Class',
+         id: 'z',
+         name: 'class',
+         owner: null,
+         bounds: { x: 0, y: 0, width: 100, height: 100 },
+       },
+       w: {
+         type: 'ClassInheritance',
+         id: 'w',
+         name: '...',
+         owner: null,
+         source: { element: 'y', direction: 'Up' },
+         target: { element: 'z', direction: 'Down' },
+         path: [
+           { x: 0, y: 0 },
+           { x: 200, y: 100 },
+         ],
+         bounds: { x: 0, y: 0, width: 200, height: 100 },
+       } as IUMLRelationship,
+     };
+
+     fork.next({ elements });
+
+     expect(fork.next().value).toEqual(delay(0));
+     expect(fork.next().value).toEqual(call(render, 'x'));
+
+     expect(fork.next().value).toEqual(delay(0));
+     expect(fork.next().value).toEqual(call(render, 'y'));
+
+     expect(fork.next().value).toEqual(delay(0));
+     expect(fork.next().value).toEqual(call(render, 'z'));
+
+     expect(fork.next().value).toEqual(delay(0));
+     expect(fork.next().value).toEqual(call(recalc, 'w'));
+   });
+ });
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