Merge changes I2e478d20,Ic1d4b5ce,Ic3b16835

* changes:
  Fix deleting edits when change is merged
  Revert "Fix wrong edit url being used within gr-file-list-header"
  Revert "Redirect /edit to ,edit"
diff --git a/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view.ts b/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view.ts
index 39a80e6..0c55f67 100644
--- a/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view.ts
+++ b/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view.ts
@@ -76,8 +76,9 @@
   PatchSet,
 } from '../../../utils/patch-set-util';
 import {
-  changeIsMerged,
   changeIsAbandoned,
+  changeIsMerged,
+  changeIsOpen,
   changeStatuses,
   isCc,
   isOwner,
@@ -1768,6 +1769,17 @@
    */
   _processEdit(change: ParsedChangeInfo, edit?: EditInfo | false) {
     if (
+      !edit &&
+      this._patchRange?.patchNum === EditPatchSetNum &&
+      changeIsOpen(change)
+    ) {
+      fireAlert(this, 'Change edit not found. Please create a change edit.');
+      GerritNav.navigateToChange(change);
+      return;
+    }
+
+    if (
+      !edit &&
       (changeIsMerged(change) || changeIsAbandoned(change)) &&
       this._editMode
     ) {
@@ -1970,13 +1982,32 @@
 
   _getCommitInfo() {
     if (!this._changeNum)
-      throw new Error('missing required changeNum property');
+      throw new Error('missing required _changeNum property');
     if (!this._patchRange)
       throw new Error('missing required _patchRange property');
     if (this._patchRange.patchNum === undefined)
       throw new Error('missing required patchNum property');
+
+    // We only call _getEdit if the patchset number is an edit.
+    // We have to do this to ensure we can tell if an edit
+    // exists or not.
+    // This safely works even if a edit does not exist.
+    if (this._patchRange!.patchNum! === EditPatchSetNum) {
+      return this._getEdit().then(edit => {
+        if (!edit) {
+          return Promise.resolve();
+        }
+
+        return this._getChangeCommitInfo();
+      });
+    }
+
+    return this._getChangeCommitInfo();
+  }
+
+  _getChangeCommitInfo() {
     return this.restApiService
-      .getChangeCommitInfo(this._changeNum, this._patchRange.patchNum)
+      .getChangeCommitInfo(this._changeNum!, this._patchRange!.patchNum!)
       .then(commitInfo => {
         this._commitInfo = commitInfo;
       });
diff --git a/polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header.ts b/polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header.ts
index 71b4ac4..ff303e3 100644
--- a/polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header.ts
+++ b/polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header.ts
@@ -31,8 +31,6 @@
 import {
   AccountInfo,
   ChangeInfo,
-  EditPatchSetNum,
-  ParentPatchSetNum,
   PatchSetNum,
   CommitInfo,
   ServerInfo,
@@ -189,10 +187,6 @@
     ) {
       return;
     }
-    if (patchNum === EditPatchSetNum && basePatchNum === ParentPatchSetNum) {
-      GerritNav.navigateToChange(this.change, undefined, undefined, true);
-      return;
-    }
     GerritNav.navigateToChange(this.change, patchNum, basePatchNum);
   }
 
diff --git a/polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header_test.js b/polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header_test.js
index 9bc243d..dd70678 100644
--- a/polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header_test.js
+++ b/polygerrit-ui/app/elements/change/gr-file-list-header/gr-file-list-header_test.js
@@ -22,7 +22,6 @@
 import 'lodash/lodash.js';
 import {createRevisions} from '../../../test/test-data-generators.js';
 import {stubRestApi} from '../../../test/test-utils.js';
-import {EditPatchSetNum, ParentPatchSetNum} from '../../../types/common.js';
 
 const basicFixture = fixtureFromElement('gr-file-list-header');
 
@@ -162,34 +161,6 @@
         .calledWithExactly(element.change, 3, 1));
   });
 
-  test('navigateToChange called when range select changes with edit', () => {
-    const navigateToChangeStub = sinon.stub(GerritNav, 'navigateToChange');
-    element.change = {
-      change_id: 'Iad9dc96274af6946f3632be53b106ef80f7ba6ca',
-      revisions: {
-        rev2: {_number: 2},
-        rev1: {_number: 1},
-        rev13: {_number: 13},
-        rev3: {_number: 3},
-      },
-      status: 'NEW',
-      labels: {},
-    };
-    element.basePatchNum = 1;
-    element.patchNum = EditPatchSetNum;
-
-    const detail = {
-      detail: {
-        basePatchNum: ParentPatchSetNum,
-        patchNum: EditPatchSetNum,
-      },
-    };
-    element._handlePatchChange(detail);
-    assert.equal(navigateToChangeStub.callCount, 1);
-    assert.isTrue(navigateToChangeStub.lastCall
-        .calledWithExactly(element.change, undefined, undefined, true));
-  });
-
   test('class is applied to file list on old patch set', () => {
     const allPatchSets = [{num: 4}, {num: 2}, {num: 1}];
     assert.equal(element._computePatchInfoClass(1, allPatchSets),
diff --git a/polygerrit-ui/app/elements/core/gr-router/gr-router.ts b/polygerrit-ui/app/elements/core/gr-router/gr-router.ts
index 015fdf3..7532101 100644
--- a/polygerrit-ui/app/elements/core/gr-router/gr-router.ts
+++ b/polygerrit-ui/app/elements/core/gr-router/gr-router.ts
@@ -51,7 +51,6 @@
 import {
   BasePatchSetNum,
   DashboardId,
-  EditPatchSetNum,
   GroupId,
   NumericChangeId,
   PatchSetNum,
@@ -1601,15 +1600,6 @@
       queryMap: ctx.queryMap,
     };
 
-    // We do not want to allow "edit" to be used as a
-    // patch number. Instead redirect to ,edit.
-    if (ctx.params[4] === EditPatchSetNum && !ctx.params[6]) {
-      params.basePatchNum = undefined;
-      params.edit = true;
-      this._redirect(this._generateUrl(params));
-      return;
-    }
-
     this.reporting.setRepoName(params.project);
     this.reporting.setChangeId(changeNum);
     this._redirectOrNavigate(params);
diff --git a/polygerrit-ui/app/elements/core/gr-router/gr-router_test.js b/polygerrit-ui/app/elements/core/gr-router/gr-router_test.js
index c4674d2..6e80a35 100644
--- a/polygerrit-ui/app/elements/core/gr-router/gr-router_test.js
+++ b/polygerrit-ui/app/elements/core/gr-router/gr-router_test.js
@@ -22,7 +22,6 @@
 import {stubBaseUrl, stubRestApi, addListenerForTest} from '../../../test/test-utils.js';
 import {_testOnly_RoutePattern} from './gr-router.js';
 import {GerritView} from '../../../services/router/router-model.js';
-import {EditPatchSetNum} from '../../../types/common.js';
 
 const basicFixture = fixtureFromElement('gr-router');
 
@@ -1430,16 +1429,16 @@
       suite('_handleChangeRoute', () => {
         let normalizeRangeStub;
 
-        function makeParams(path, hash, baseNum, patchNum) {
+        function makeParams(path, hash) {
           return {
             params: [
               'foo/bar', // 0 Project
               1234, // 1 Change number
               null, // 2 Unused
               null, // 3 Unused
-              baseNum ? baseNum : 4, // 4 Base patch number
+              4, // 4 Base patch number
               null, // 5 Unused
-              patchNum ? patchNum : 7, // 6 Patch number
+              7, // 6 Patch number
             ],
             queryMap: new Map(),
           };
@@ -1477,23 +1476,6 @@
           assert.isFalse(redirectStub.called);
           assert.isTrue(normalizeRangeStub.called);
         });
-
-        test('redirect due to patchNum being an edit', () => {
-          normalizeRangeStub.returns(true);
-          const ctx = makeParams(null, '');
-          element._handleChangeRoute(ctx, undefined, EditPatchSetNum, false);
-          assert.isTrue(normalizeRangeStub.called);
-          assert.isFalse(setParamsStub.called);
-          assert.isTrue(redirectStub.calledOnce);
-
-          const params = {
-            view: GerritView.CHANGE,
-            changeNum: '1234',
-            project: 'test',
-            edit: true,
-          };
-          assert.equal(element._generateUrl(params), '/c/test/+/1234,edit');
-        });
       });
 
       suite('_handleDiffRoute', () => {