Open first 10 merge request files in IDE

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/51635

app/assets/javascripts/ide/stores/actions/file.js

@@ -56,7 +56,10 @@ export const setFileActive = ({ commit, state, getters, dispatch }, path) => {
   dispatch('scrollToTab');
 };
 
-export const getFileData = ({ state, commit, dispatch }, { path, makeFileActive = true }) => {
+export const getFileData = (
+  { state, commit, dispatch },
+  { path, makeFileActive = true, openFile = makeFileActive },
+) => {
   const file = state.entries[path];
 
   if (file.raw || (file.tempFile && !file.prevPath)) return Promise.resolve();
@@ -72,7 +75,7 @@ export const getFileData = ({ state, commit, dispatch }, { path, makeFileActive
       setPageTitle(decodeURI(normalizedHeaders['PAGE-TITLE']));
 
       commit(types.SET_FILE_DATA, { data, file });
-      if (makeFileActive) commit(types.TOGGLE_FILE_OPEN, path);
+      if (openFile) commit(types.TOGGLE_FILE_OPEN, path);
       if (makeFileActive) dispatch('setFileActive', path);
       commit(types.TOGGLE_LOADING, { entry: file });
     })

app/assets/javascripts/ide/stores/actions/merge_request.js

@@ -161,6 +161,7 @@ export const openMergeRequest = (
             dispatch('getFileData', {
               path: change.new_path,
               makeFileActive: ind === 0,
+              openFile: true,
             });
           }
         }

changelogs/unreleased/ide-open-all-mr-files.yml

+---
+title: Open first 10 merge request files in IDE
+merge_request:
+author:
+type: fixed

spec/javascripts/ide/stores/actions/merge_request_spec.js

@@ -321,6 +321,7 @@ describe('IDE store merge request actions', () => {
             expect(store.dispatch).toHaveBeenCalledWith('getFileData', {
               path: change.new_path,
               makeFileActive: i === 0,
+              openFile: true,
             });
           });
         })