Assign selected revision correctly if current patch is edit Change-Id: I78fec2ad8989b2053e5b8b8748de0f4734962d1f

diff --git a/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view.js b/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view.js
index ed62918..fa84b95 100644
--- a/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view.js
+++ b/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view.js

@@ -1821,7 +1821,8 @@
       if (!this._selectedRevision) {
         return;
       }
-      const patchNum = parseInt(patchNumStr, 10);
+      // If patchNumStr is"edit", then patchNum is undefined hence an OR
+      const patchNum = parseInt(patchNumStr, 10) || patchNumStr;
       if (patchNum === this._selectedRevision._number) {
         return;
       }

diff --git a/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view_test.html b/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view_test.html
index d9b8464..b80b51e 100644
--- a/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view_test.html
+++ b/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view_test.html

@@ -1617,6 +1617,30 @@
       });
     });
 
+    test('_selectedRevision is assigned when patchNum is edit', () => {
+      const revision1 = {_number: 1, commit: {parents: []}};
+      const revision2 = {_number: 2, commit: {parents: []}};
+      const revision3 = {_number: 'edit', commit: {parents: []}};
+      sandbox.stub(element.$.restAPI, 'getChangeDetail').returns(
+          Promise.resolve({
+            revisions: {
+              aaa: revision1,
+              bbb: revision2,
+              ccc: revision3,
+            },
+            labels: {},
+            actions: {},
+            current_revision: 'ccc',
+            change_id: 'loremipsumdolorsitamet',
+          }));
+      sandbox.stub(element, '_getEdit').returns(Promise.resolve());
+      sandbox.stub(element, '_getPreferences').returns(Promise.resolve({}));
+      element._patchRange = {patchNum: 'edit'};
+      return element._getChangeDetail().then(() => {
+        assert.strictEqual(element._selectedRevision, revision3);
+      });
+    });
+
     test('_sendShowChangeEvent', () => {
       element._change = {labels: {}};
       element._patchRange = {patchNum: 4};