Always use batch diffs endpoint

Changes the batch diffs endpoint to always be called
even if we aren't on the latest diff version

https://gitlab.com/gitlab-org/gitlab/issues/35754

app/assets/javascripts/diffs/components/app.vue

@@ -220,9 +220,6 @@ export default {
       this.assignedDiscussions = false;
       this.fetchData(false);
     },
-    isLatestVersion() {
-      return window.location.search.indexOf('diff_id') === -1;
-    },
     startDiffRendering() {
       requestIdleCallback(
         () => {
@@ -232,7 +229,7 @@ export default {
       );
     },
     fetchData(toggleTree = true) {
-      if (this.isLatestVersion() && this.glFeatures.diffsBatchLoad) {
+      if (this.glFeatures.diffsBatchLoad) {
         this.fetchDiffFilesMeta()
           .then(() => {
             if (toggleTree) this.hideTreeListIfJustOneFile();

app/assets/javascripts/diffs/store/actions.js

@@ -90,14 +90,13 @@ export const fetchDiffFiles = ({ state, commit }) => {
 };
 
 export const fetchDiffFilesBatch = ({ commit, state }) => {
-  const baseUrl = `${state.endpointBatch}?per_page=${DIFFS_PER_PAGE}`;
-  const url = page => (page ? `${baseUrl}&page=${page}` : baseUrl);
-
   commit(types.SET_BATCH_LOADING, true);
 
   const getBatch = page =>
     axios
-      .get(url(page))
+      .get(state.endpointBatch, {
+        params: { page, per_page: DIFFS_PER_PAGE, w: state.showWhitespace ? '0' : '1' },
+      })
       .then(({ data: { pagination, diff_files } }) => {
         commit(types.SET_DIFF_DATA_BATCH, { diff_files });
         commit(types.SET_BATCH_LOADING, false);

spec/javascripts/diffs/components/app_spec.js

@@ -92,16 +92,16 @@ describe('diffs/components/app', () => {
       });
     });
 
-    it('calls fetchDiffFiles if diffsBatchLoad is enabled, and not latest version', () => {
+    it('calls batch methods if diffsBatchLoad is enabled, and not latest version', () => {
       wrapper.vm.glFeatures.diffsBatchLoad = true;
       wrapper.vm.isLatestVersion = () => false;
       wrapper.vm.fetchData(false);
 
-      expect(wrapper.vm.fetchDiffFiles).toHaveBeenCalled();
+      expect(wrapper.vm.fetchDiffFiles).not.toHaveBeenCalled();
       wrapper.vm.$nextTick(() => {
         expect(wrapper.vm.startRenderDiffsQueue).toHaveBeenCalled();
-        expect(wrapper.vm.fetchDiffFilesMeta).not.toHaveBeenCalled();
-        expect(wrapper.vm.fetchDiffFilesBatch).not.toHaveBeenCalled();
+        expect(wrapper.vm.fetchDiffFilesMeta).toHaveBeenCalled();
+        expect(wrapper.vm.fetchDiffFilesBatch).toHaveBeenCalled();
       });
     });
 

spec/javascripts/diffs/store/actions_spec.js

@@ -147,13 +147,15 @@ describe('DiffsStoreActions', () => {
   describe('fetchDiffFilesBatch', () => {
     it('should fetch batch diff files', done => {
       const endpointBatch = '/fetch/diffs_batch';
-      const batch1 = `${endpointBatch}?per_page=${DIFFS_PER_PAGE}`;
-      const batch2 = `${endpointBatch}?per_page=${DIFFS_PER_PAGE}&page=2`;
       const mock = new MockAdapter(axios);
       const res1 = { diff_files: [], pagination: { next_page: 2 } };
       const res2 = { diff_files: [], pagination: {} };
-      mock.onGet(batch1).reply(200, res1);
-      mock.onGet(batch2).reply(200, res2);
+      mock
+        .onGet(endpointBatch, { params: { page: undefined, per_page: DIFFS_PER_PAGE, w: '1' } })
+        .reply(200, res1);
+      mock
+        .onGet(endpointBatch, { params: { page: 2, per_page: DIFFS_PER_PAGE, w: '1' } })
+        .reply(200, res2);
 
       testAction(
         fetchDiffFilesBatch,