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 3f09f74..e4a2cec 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
@@ -353,15 +353,22 @@
   @state()
   private latestCommitMessage: string | null = '';
 
+  @state() basePatchNum: BasePatchSetNum = PARENT;
+
+  @state() patchNum?: RevisionPatchSetNum;
+
+  // TODO: Migrate usages to this.patchNum and this.basePatchnum.
   // Use patchRange getter/setter.
   private _patchRange?: ChangeViewPatchRange;
 
+  // TODO: Migrate usages to this.patchNum and this.basePatchnum.
   // Private but used in tests.
   @state()
   get patchRange() {
     return this._patchRange;
   }
 
+  // TODO: Migrate usages to this.patchNum and this.basePatchnum.
   set patchRange(patchRange: ChangeViewPatchRange | undefined) {
     if (this._patchRange === patchRange) return;
     const oldPatchRange = this._patchRange;
@@ -414,16 +421,8 @@
   private updateCheckTimerHandle?: number | null;
 
   // Private but used in tests.
-  getEditMode() {
-    if (!this.patchRange || !this.viewState) {
-      return false;
-    }
-
-    if (this.viewState.edit) {
-      return true;
-    }
-
-    return this.patchRange.patchNum === EDIT;
+  getEditMode(): boolean {
+    return !!this.viewState?.edit || this.patchNum === EDIT;
   }
 
   isSubmitEnabled(): boolean {
@@ -737,6 +736,16 @@
     );
     subscribe(
       this,
+      () => this.getChangeModel().patchNum$,
+      patchNum => (this.patchNum = patchNum)
+    );
+    subscribe(
+      this,
+      () => this.getChangeModel().basePatchNum$,
+      basePatchNum => (this.basePatchNum = basePatchNum)
+    );
+    subscribe(
+      this,
       () => this.getUserModel().account$,
       account => {
         this.account = account;
@@ -2156,12 +2165,12 @@
   // Private but used in tests.
   handleMessageAnchorTap(e: CustomEvent<{id: string}>) {
     assertIsDefined(this.change, 'change');
-    assertIsDefined(this.patchRange, 'patchRange');
+    assertIsDefined(this.patchNum, 'patchNum');
     const hash = PREFIX + e.detail.id;
     const url = createChangeUrl({
       change: this.change,
-      patchNum: this.patchRange.patchNum,
-      basePatchNum: this.patchRange.basePatchNum,
+      patchNum: this.patchNum,
+      basePatchNum: this.basePatchNum,
       edit: this.getEditMode(),
       messageHash: hash,
     });
@@ -2359,13 +2368,13 @@
   // Private but used in tests.
   handleDiffAgainstBase() {
     assertIsDefined(this.change, 'change');
-    assertIsDefined(this.patchRange, 'patchRange');
-    if (this.patchRange.basePatchNum === PARENT) {
+    assertIsDefined(this.patchNum, 'patchNum');
+    if (this.basePatchNum === PARENT) {
       fireAlert(this, 'Base is already selected.');
       return;
     }
     this.getNavigation().setUrl(
-      createChangeUrl({change: this.change, patchNum: this.patchRange.patchNum})
+      createChangeUrl({change: this.change, patchNum: this.patchNum})
     );
   }
 
@@ -2373,16 +2382,16 @@
   handleDiffBaseAgainstLeft() {
     if (this.viewState?.childView !== ChangeChildView.OVERVIEW) return;
     assertIsDefined(this.change, 'change');
-    assertIsDefined(this.patchRange, 'patchRange');
+    assertIsDefined(this.patchNum, 'patchNum');
 
-    if (this.patchRange.basePatchNum === PARENT) {
+    if (this.basePatchNum === PARENT) {
       fireAlert(this, 'Left is already base.');
       return;
     }
     this.getNavigation().setUrl(
       createChangeUrl({
         change: this.change,
-        patchNum: this.patchRange.basePatchNum as RevisionPatchSetNum,
+        patchNum: this.basePatchNum as RevisionPatchSetNum,
       })
     );
   }
@@ -2390,9 +2399,9 @@
   // Private but used in tests.
   handleDiffAgainstLatest() {
     assertIsDefined(this.change, 'change');
-    assertIsDefined(this.patchRange, 'patchRange');
+    assertIsDefined(this.patchNum, 'patchNum');
     const latestPatchNum = computeLatestPatchNum(this.allPatchSets);
-    if (this.patchRange.patchNum === latestPatchNum) {
+    if (this.patchNum === latestPatchNum) {
       fireAlert(this, 'Latest is already selected.');
       return;
     }
@@ -2400,7 +2409,7 @@
       createChangeUrl({
         change: this.change,
         patchNum: latestPatchNum,
-        basePatchNum: this.patchRange.basePatchNum,
+        basePatchNum: this.basePatchNum,
       })
     );
   }
@@ -2408,9 +2417,9 @@
   // Private but used in tests.
   handleDiffRightAgainstLatest() {
     assertIsDefined(this.change, 'change');
-    assertIsDefined(this.patchRange, 'patchRange');
+    assertIsDefined(this.patchNum, 'patchNum');
     const latestPatchNum = computeLatestPatchNum(this.allPatchSets);
-    if (this.patchRange.patchNum === latestPatchNum) {
+    if (this.patchNum === latestPatchNum) {
       fireAlert(this, 'Right is already latest.');
       return;
     }
@@ -2418,7 +2427,7 @@
       createChangeUrl({
         change: this.change,
         patchNum: latestPatchNum,
-        basePatchNum: this.patchRange.patchNum as BasePatchSetNum,
+        basePatchNum: this.patchNum as BasePatchSetNum,
       })
     );
   }
@@ -2426,12 +2435,9 @@
   // Private but used in tests.
   handleDiffBaseAgainstLatest() {
     assertIsDefined(this.change, 'change');
-    assertIsDefined(this.patchRange, 'patchRange');
+    assertIsDefined(this.patchNum, 'patchNum');
     const latestPatchNum = computeLatestPatchNum(this.allPatchSets);
-    if (
-      this.patchRange.patchNum === latestPatchNum &&
-      this.patchRange.basePatchNum === PARENT
-    ) {
+    if (this.patchNum === latestPatchNum && this.basePatchNum === PARENT) {
       fireAlert(this, 'Already diffing base against latest.');
       return;
     }
@@ -2550,7 +2556,7 @@
     if (
       !editRev &&
       (changeIsMerged(change) || changeIsAbandoned(change)) &&
-      this.getEditMode()
+      (this.patchRange?.patchNum === EDIT || this.viewState?.edit)
     ) {
       fireAlert(
         this,
@@ -3048,7 +3054,7 @@
       );
     if (!controls) throw new Error('Missing edit controls');
     assertIsDefined(this.change, 'change');
-    assertIsDefined(this.patchRange, 'patchRange');
+    assertIsDefined(this.patchNum, 'patchNum');
 
     const path = e.detail.path;
     switch (e.detail.action) {
@@ -3056,12 +3062,12 @@
         controls.openDeleteDialog(path);
         break;
       case GrEditConstants.Actions.OPEN.id:
-        assertIsDefined(this.patchRange.patchNum, 'patchset number');
+        assertIsDefined(this.patchNum, 'patchset number');
         this.getNavigation().setUrl(
           createEditUrl({
             changeNum: this.change._number,
             repo: this.change.project,
-            patchNum: this.patchRange.patchNum,
+            patchNum: this.patchNum,
             editView: {path},
           })
         );
@@ -3119,11 +3125,11 @@
 
   private handleStopEditTap() {
     assertIsDefined(this.change, 'change');
-    assertIsDefined(this.patchRange, 'patchRange');
+    assertIsDefined(this.patchNum, 'patchNum');
     this.getNavigation().setUrl(
       createChangeUrl({
         change: this.change,
-        patchNum: this.patchRange.patchNum,
+        patchNum: this.patchNum,
         forceReload: true,
       })
     );
diff --git a/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view_test.ts b/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view_test.ts
index 21b163f..df48192 100644
--- a/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view_test.ts
+++ b/polygerrit-ui/app/elements/change/gr-change-view/gr-change-view_test.ts
@@ -544,10 +544,7 @@
 
   test('handleMessageAnchorTap', async () => {
     element.changeNum = 1 as NumericChangeId;
-    element.patchRange = {
-      basePatchNum: PARENT,
-      patchNum: 1 as RevisionPatchSetNum,
-    };
+    element.patchNum = 1 as RevisionPatchSetNum;
     element.change = createChangeViewChange();
     await element.updateComplete;
     const replaceStateStub = sinon.stub(history, 'replaceState');
@@ -563,10 +560,8 @@
       ...createChangeViewChange(),
       revisions: createRevisions(10),
     };
-    element.patchRange = {
-      patchNum: 3 as RevisionPatchSetNum,
-      basePatchNum: 1 as BasePatchSetNum,
-    };
+    element.basePatchNum = 1 as BasePatchSetNum;
+    element.patchNum = 3 as RevisionPatchSetNum;
     element.handleDiffAgainstBase();
     assert.isTrue(setUrlStub.called);
     assert.equal(setUrlStub.lastCall.firstArg, '/c/test-project/+/42/3');
@@ -577,10 +572,8 @@
       ...createChangeViewChange(),
       revisions: createRevisions(10),
     };
-    element.patchRange = {
-      basePatchNum: 1 as BasePatchSetNum,
-      patchNum: 3 as RevisionPatchSetNum,
-    };
+    element.basePatchNum = 1 as BasePatchSetNum;
+    element.patchNum = 3 as RevisionPatchSetNum;
     element.handleDiffAgainstLatest();
     assert.isTrue(setUrlStub.called);
     assert.equal(setUrlStub.lastCall.firstArg, '/c/test-project/+/42/1..10');
@@ -591,10 +584,8 @@
       ...createChangeViewChange(),
       revisions: createRevisions(10),
     };
-    element.patchRange = {
-      patchNum: 3 as RevisionPatchSetNum,
-      basePatchNum: 1 as BasePatchSetNum,
-    };
+    element.basePatchNum = 1 as BasePatchSetNum;
+    element.patchNum = 3 as RevisionPatchSetNum;
     element.handleDiffBaseAgainstLeft();
     assert.isTrue(setUrlStub.called);
     assert.equal(setUrlStub.lastCall.firstArg, '/c/test-project/+/42/1');
@@ -605,10 +596,8 @@
       ...createChangeViewChange(),
       revisions: createRevisions(10),
     };
-    element.patchRange = {
-      basePatchNum: 1 as BasePatchSetNum,
-      patchNum: 3 as RevisionPatchSetNum,
-    };
+    element.basePatchNum = 1 as BasePatchSetNum;
+    element.patchNum = 3 as RevisionPatchSetNum;
     element.handleDiffRightAgainstLatest();
     assert.isTrue(setUrlStub.called);
     assert.equal(setUrlStub.lastCall.firstArg, '/c/test-project/+/42/3..10');
@@ -619,10 +608,8 @@
       ...createChangeViewChange(),
       revisions: createRevisions(10),
     };
-    element.patchRange = {
-      basePatchNum: 1 as BasePatchSetNum,
-      patchNum: 3 as RevisionPatchSetNum,
-    };
+    element.basePatchNum = 1 as BasePatchSetNum;
+    element.patchNum = 3 as RevisionPatchSetNum;
     element.handleDiffBaseAgainstLatest();
     assert.isTrue(setUrlStub.called);
     assert.equal(setUrlStub.lastCall.firstArg, '/c/test-project/+/42/10');
@@ -1869,6 +1856,8 @@
   test('computeEditMode', async () => {
     const callCompute = async (viewState: ChangeViewState) => {
       element.viewState = viewState;
+      element.patchNum = viewState.patchNum;
+      element.basePatchNum = viewState.basePatchNum ?? PARENT;
       await element.updateComplete;
       return element.getEditMode();
     };
@@ -1932,10 +1921,7 @@
   });
 
   test('file-action-tap handling', async () => {
-    element.patchRange = {
-      basePatchNum: PARENT,
-      patchNum: 1 as RevisionPatchSetNum,
-    };
+    element.patchNum = 1 as RevisionPatchSetNum;
     element.change = {
       ...createChangeViewChange(),
     };
@@ -2178,7 +2164,7 @@
     assertIsDefined(element.actions);
     sinon.stub(element.metadata, 'computeLabelNames');
 
-    element.patchRange = {patchNum: 1 as RevisionPatchSetNum};
+    element.patchNum = 1 as RevisionPatchSetNum;
     element.actions.dispatchEvent(
       new CustomEvent('stop-edit-tap', {bubbles: false})
     );
diff --git a/polygerrit-ui/app/utils/patch-set-util.ts b/polygerrit-ui/app/utils/patch-set-util.ts
index 7e16ad9..7f3b6eb 100644
--- a/polygerrit-ui/app/utils/patch-set-util.ts
+++ b/polygerrit-ui/app/utils/patch-set-util.ts
@@ -35,11 +35,6 @@
   wip?: boolean;
 }
 
-interface PatchRange {
-  patchNum?: RevisionPatchSetNum;
-  basePatchNum?: BasePatchSetNum;
-}
-
 /**
  * Whether the given patch is a numbered parent of a merge (i.e. a negative
  * number).
@@ -294,10 +289,6 @@
   return allPatchSets[0].num === EDIT;
 }
 
-export function hasEditPatchsetLoaded(patchRange: PatchRange) {
-  return patchRange.patchNum === EDIT;
-}
-
 /**
  * @param revisions A sorted array of revisions.
  *