diff --git a/lib/atom/pane-item.js b/lib/atom/pane-item.js
index 4f697fa3f2..ecbe19df39 100644
--- a/lib/atom/pane-item.js
+++ b/lib/atom/pane-item.js
@@ -5,7 +5,8 @@ import {CompositeDisposable} from 'event-kit';
 
 import URIPattern, {nonURIMatch} from './uri-pattern';
 import RefHolder from '../models/ref-holder';
-import {createItem} from '../helpers';
+import StubItem from '../atom-items/stub-item';
+import {createItem, autobind} from '../helpers';
 
 /**
  * PaneItem registers an opener with the current Atom workspace as long as this component is mounted. The opener will
@@ -37,17 +38,22 @@ export default class PaneItem extends React.Component {
 
   constructor(props) {
     super(props);
+    autobind(this, 'opener');
 
     const uriPattern = new URIPattern(this.props.uriPattern);
     const currentlyOpen = this.props.workspace.getPaneItems()
-      .map(item => {
+      .reduce((arr, item) => {
         const element = item.getElement ? item.getElement() : null;
         const match = item.getURI ? uriPattern.matches(item.getURI()) : nonURIMatch;
         const stub = item.setRealItem ? item : null;
-        return {element, match, stub};
-      })
-      .filter(each => each.element && each.match.ok())
-      .map(each => new OpenItem(each.match, each.element, each.stub));
+
+        if (element && match.ok()) {
+          const openItem = new OpenItem(match, element, stub);
+          arr.push(openItem);
+        }
+
+        return arr;
+      }, []);
 
     this.subs = new CompositeDisposable();
     this.state = {uriPattern, currentlyOpen};
@@ -65,9 +71,11 @@ export default class PaneItem extends React.Component {
 
   componentDidMount() {
     for (const openItem of this.state.currentlyOpen) {
-      this.subs.add(this.closeListener(openItem.stubItem, openItem));
+      this.registerCloseListener(openItem.stubItem, openItem);
 
-      openItem.hydrateStub();
+      openItem.hydrateStub({
+        copy: () => this.copyOpenItem(openItem),
+      });
     }
 
     this.subs.add(this.props.workspace.addOpener(this.opener));
@@ -76,7 +84,7 @@ export default class PaneItem extends React.Component {
   render() {
     return this.state.currentlyOpen.map(item => {
       return (
-        <Fragment key={item.getURI()}>
+        <Fragment key={item.getKey()}>
           {item.renderPortal(this.props.children)}
         </Fragment>
       );
@@ -87,7 +95,7 @@ export default class PaneItem extends React.Component {
     this.subs.dispose();
   }
 
-  opener = uri => {
+  opener(uri) {
     const m = this.state.uriPattern.matches(uri);
     if (!m.ok()) {
       return undefined;
@@ -99,23 +107,48 @@ export default class PaneItem extends React.Component {
       this.setState(prevState => ({
         currentlyOpen: [...prevState.currentlyOpen, openItem],
       }), () => {
-        const paneItem = openItem.create();
+        const paneItem = openItem.create({
+          copy: () => this.copyOpenItem(openItem),
+        });
+        this.registerCloseListener(paneItem, openItem);
+        resolve(paneItem);
+      });
+    });
+  }
 
-        this.subs.add(this.closeListener(paneItem, openItem));
+  copyOpenItem(openItem) {
+    const m = this.state.uriPattern.matches(openItem.getURI());
+    if (!m.ok()) {
+      return null;
+    }
 
-        resolve(paneItem);
+    const stub = StubItem.create('generic', openItem.getStubProps(), openItem.getURI());
+
+    const copiedItem = new OpenItem(m, stub.getElement(), stub);
+    this.setState(prevState => ({
+      currentlyOpen: [...prevState.currentlyOpen, copiedItem],
+    }), () => {
+      this.registerCloseListener(stub, copiedItem);
+      copiedItem.hydrateStub({
+        copy: () => this.copyOpenItem(copiedItem),
       });
     });
+
+    return stub;
   }
 
-  closeListener(paneItem, openItem) {
-    return this.props.workspace.onDidDestroyPaneItem(({item}) => {
+  registerCloseListener(paneItem, openItem) {
+    const sub = this.props.workspace.onDidDestroyPaneItem(({item}) => {
       if (item === paneItem) {
+        sub.dispose();
+        this.subs.remove(sub);
         this.setState(prevState => ({
           currentlyOpen: prevState.currentlyOpen.filter(each => each !== openItem),
         }));
       }
     });
+
+    this.subs.add(sub);
   }
 }
 
@@ -123,7 +156,12 @@ export default class PaneItem extends React.Component {
  * A subtree rendered through a portal onto a detached DOM node for use as the root as a PaneItem.
  */
 class OpenItem {
+  static nextID = 0
+
   constructor(match, element = null, stub = null) {
+    this.id = this.constructor.nextID;
+    this.constructor.nextID++;
+
     this.domNode = element || document.createElement('div');
     this.stubItem = stub;
     this.match = match;
@@ -134,18 +172,34 @@ class OpenItem {
     return this.match.getURI();
   }
 
-  create() {
+  create(extra = {}) {
     const h = this.itemHolder.isEmpty() ? null : this.itemHolder;
-    return createItem(this.domNode, h, this.match.getURI());
+    return createItem(this.domNode, h, this.match.getURI(), extra);
   }
 
-  hydrateStub() {
+  hydrateStub(extra = {}) {
     if (this.stubItem) {
-      this.stubItem.setRealItem(this.create());
+      this.stubItem.setRealItem(this.create(extra));
       this.stubItem = null;
     }
   }
 
+  getKey() {
+    return this.id;
+  }
+
+  getStubProps() {
+    if (!this.itemHolder.isEmpty()) {
+      const item = this.itemHolder.get();
+      return {
+        title: item.getTitle ? item.getTitle() : null,
+        iconName: item.getIconName ? item.getIconName() : null,
+      };
+    } else {
+      return {};
+    }
+  }
+
   renderPortal(renderProp) {
     return ReactDOM.createPortal(
       renderProp({
diff --git a/lib/controllers/file-patch-controller.js b/lib/controllers/file-patch-controller.js
index d4982c5f8f..ffe6bc062e 100644
--- a/lib/controllers/file-patch-controller.js
+++ b/lib/controllers/file-patch-controller.js
@@ -114,10 +114,6 @@ export default class FilePatchController extends React.Component {
     };
   }
 
-  copy() {
-    return this.props.deserializers.deserialize(this.serialize());
-  }
-
   onDidDestroy(callback) {
     return this.emitter.on('did-destroy', callback);
   }
diff --git a/lib/helpers.js b/lib/helpers.js
index 8cdebf1f21..18bcadbe45 100644
--- a/lib/helpers.js
+++ b/lib/helpers.js
@@ -347,11 +347,13 @@ export function extractCoAuthorsAndRawCommitMessage(commitMessage) {
   return {message: rawMessage, coAuthors};
 }
 
-export function createItem(node, componentHolder = null, uri = null) {
+export function createItem(node, componentHolder = null, uri = null, extra = {}) {
   const override = {
     getElement: () => node,
 
     getRealItem: () => componentHolder.get(),
+
+    ...extra,
   };
 
   if (uri) {
diff --git a/test/atom/pane-item.test.js b/test/atom/pane-item.test.js
index 29c79ffe51..6fe95f71e1 100644
--- a/test/atom/pane-item.test.js
+++ b/test/atom/pane-item.test.js
@@ -127,6 +127,20 @@ describe('PaneItem', function() {
       assert.lengthOf(wrapper.update().find('Component'), 2);
     });
 
+    it('renders a different child item for each item in a different Pane', async function() {
+      const wrapper = mount(
+        <PaneItem workspace={workspace} uriPattern="atom-github://pattern/{id}">
+          {() => <Component text="a prop" />}
+        </PaneItem>,
+      );
+
+      const item0 = await workspace.open('atom-github://pattern/1');
+      const pane0 = workspace.paneForItem(item0);
+      pane0.splitRight({copyActiveItem: true});
+
+      assert.lengthOf(wrapper.update().find('Component'), 2);
+    });
+
     it('passes matched parameters to its render prop', async function() {
       let calledWith = null;
       mount(