Update action name to be more accurate

When we execute the SET_CURRENT_DIFF_FILE mutation, there is
no toggle. Since that's the only thing this action does, the
name should reflect that it's a setter.

app/assets/javascripts/batch_comments/components/preview_dropdown.vue

@@ -15,14 +15,14 @@ export default {
     ...mapGetters('batchComments', ['draftsCount', 'sortedDrafts']),
   },
   methods: {
-    ...mapActions('diffs', ['toggleActiveFileByHash']),
+    ...mapActions('diffs', ['setCurrentFileHash']),
     ...mapActions('batchComments', ['scrollToDraft']),
     isLast(index) {
       return index === this.sortedDrafts.length - 1;
     },
     async onClickDraft(draft) {
       if (this.viewDiffsFileByFile && draft.file_hash) {
-        await this.toggleActiveFileByHash(draft.file_hash);
+        await this.setCurrentFileHash(draft.file_hash);
       }
 
       await this.scrollToDraft(draft);

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

@@ -221,7 +221,7 @@ export default {
       'toggleFileDiscussions',
       'toggleFileDiscussionWrappers',
       'toggleFullDiff',
-      'toggleActiveFileByHash',
+      'setCurrentFileHash',
       'reviewFile',
       'setFileCollapsedByUser',
     ]),
@@ -244,7 +244,7 @@ export default {
         scrollToElement(document.querySelector(selector));
         window.location.hash = selector;
         if (!this.viewDiffsFileByFile) {
-          this.toggleActiveFileByHash(this.diffFile.file_hash);
+          this.setCurrentFileHash(this.diffFile.file_hash);
         }
       }
     },

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

@@ -520,7 +520,7 @@ export const toggleTreeOpen = ({ commit }, path) => {
   commit(types.TOGGLE_FOLDER_OPEN, path);
 };
 
-export const toggleActiveFileByHash = ({ commit }, hash) => {
+export const setCurrentFileHash = ({ commit }, hash) => {
   commit(types.SET_CURRENT_DIFF_FILE, hash);
 };
 

spec/frontend/batch_comments/components/preview_dropdown_spec.js

@@ -7,7 +7,7 @@ Vue.use(Vuex);
 
 let wrapper;
 
-const toggleActiveFileByHash = jest.fn();
+const setCurrentFileHash = jest.fn();
 const scrollToDraft = jest.fn();
 
 function factory({ viewDiffsFileByFile = false, draftsCount = 1, sortedDrafts = [] } = {}) {
@@ -16,7 +16,7 @@ function factory({ viewDiffsFileByFile = false, draftsCount = 1, sortedDrafts =
       diffs: {
         namespaced: true,
         actions: {
-          toggleActiveFileByHash,
+          setCurrentFileHash,
         },
         state: {
           viewDiffsFileByFile,
@@ -51,7 +51,7 @@ describe('Batch comments preview dropdown', () => {
 
       await Vue.nextTick();
 
-      expect(toggleActiveFileByHash).toHaveBeenCalledWith(expect.anything(), 'hash');
+      expect(setCurrentFileHash).toHaveBeenCalledWith(expect.anything(), 'hash');
       expect(scrollToDraft).toHaveBeenCalledWith(expect.anything(), { id: 1, file_hash: 'hash' });
     });
 

spec/frontend/diffs/components/diff_file_header_spec.js

@@ -59,7 +59,7 @@ describe('DiffFileHeader component', () => {
           toggleFileDiscussions: jest.fn(),
           toggleFileDiscussionWrappers: jest.fn(),
           toggleFullDiff: jest.fn(),
-          toggleActiveFileByHash: jest.fn(),
+          setCurrentFileHash: jest.fn(),
           setFileCollapsedByUser: jest.fn(),
           reviewFile: jest.fn(),
         },