9 files changed, 58 insertions, 39 deletions
diff --git a/app/assets/javascripts/ide/stores/actions/file.js b/app/assets/javascripts/ide/stores/actions/file.js
index cec4ce204f8..99e13e32ba4 100644
--- a/app/assets/javascripts/ide/stores/actions/file.js
+++ b/app/assets/javascripts/ide/stores/actions/file.js
@@ -61,8 +61,10 @@ export const getFileData = (
   { path, makeFileActive = true, openFile = makeFileActive },
 ) => {
   const file = state.entries[path];
+  const fileDeletedAndReadded = getters.isFileDeletedAndReadded(path);
 
-  if (file.raw || (file.tempFile && !file.prevPath)) return Promise.resolve();
+  if (file.raw || (file.tempFile && !file.prevPath && !fileDeletedAndReadded))
+    return Promise.resolve();
 
   commit(types.TOGGLE_LOADING, { entry: file });
 
@@ -102,11 +104,16 @@ export const setFileMrChange = ({ commit }, { file, mrChange }) => {
 
 export const getRawFileData = ({ state, commit, dispatch, getters }, { path }) => {
   const file = state.entries[path];
+  const stagedFile = state.stagedFiles.find(f => f.path === path);
+
   return new Promise((resolve, reject) => {
+    const fileDeletedAndReadded = getters.isFileDeletedAndReadded(path);
     service
-      .getRawFileData(file)
+      .getRawFileData(fileDeletedAndReadded ? stagedFile : file)
       .then(raw => {
-        if (!(file.tempFile && !file.prevPath)) commit(types.SET_FILE_RAW_DATA, { file, raw });
+        if (!(file.tempFile && !file.prevPath && !fileDeletedAndReadded))
+          commit(types.SET_FILE_RAW_DATA, { file, raw, fileDeletedAndReadded });
+
         if (file.mrChange && file.mrChange.new_file === false) {
           const baseSha =
             (getters.currentMergeRequest && getters.currentMergeRequest.baseCommitSha) || '';
@@ -151,7 +158,7 @@ export const changeFileContent = ({ commit, dispatch, state }, { path, content }
 
   if (file.changed && indexOfChangedFile === -1) {
     commit(types.ADD_FILE_TO_CHANGED, path);
-  } else if (!file.changed && indexOfChangedFile !== -1) {
+  } else if (!file.changed && !file.tempFile && indexOfChangedFile !== -1) {
     commit(types.REMOVE_FILE_FROM_CHANGED, path);
   }
 
diff --git a/app/assets/javascripts/ide/stores/mutations/file.js b/app/assets/javascripts/ide/stores/mutations/file.js
index 73d03e57f54..313fa1fe029 100644
--- a/app/assets/javascripts/ide/stores/mutations/file.js
+++ b/app/assets/javascripts/ide/stores/mutations/file.js
@@ -54,27 +54,29 @@ export default {
       }
     });
   },
-  [types.SET_FILE_RAW_DATA](state, { file, raw }) {
+  [types.SET_FILE_RAW_DATA](state, { file, raw, fileDeletedAndReadded = false }) {
     const openPendingFile = state.openFiles.find(
-      f => f.path === file.path && f.pending && !(f.tempFile && !f.prevPath),
+      f =>
+        f.path === file.path && f.pending && !(f.tempFile && !f.prevPath && !fileDeletedAndReadded),
     );
+    const stagedFile = state.stagedFiles.find(f => f.path === file.path);
 
-    if (file.tempFile && file.content === '') {
-      Object.assign(state.entries[file.path], {
-        content: raw,
-      });
+    if (file.tempFile && file.content === '' && !fileDeletedAndReadded) {
+      Object.assign(state.entries[file.path], { content: raw });
+    } else if (fileDeletedAndReadded) {
+      Object.assign(stagedFile, { raw });
     } else {
-      Object.assign(state.entries[file.path], {
-        raw,
-      });
+      Object.assign(state.entries[file.path], { raw });
     }
 
     if (!openPendingFile) return;
 
     if (!openPendingFile.tempFile) {
       openPendingFile.raw = raw;
-    } else if (openPendingFile.tempFile) {
+    } else if (openPendingFile.tempFile && !fileDeletedAndReadded) {
       openPendingFile.content = raw;
+    } else if (fileDeletedAndReadded) {
+      Object.assign(stagedFile, { raw });
     }
   },
   [types.SET_FILE_BASE_RAW_DATA](state, { file, baseRaw }) {
diff --git a/app/assets/javascripts/repository/utils/readme.js b/app/assets/javascripts/repository/utils/readme.js
index e43b2bdc33a..ef4162f4463 100644
--- a/app/assets/javascripts/repository/utils/readme.js
+++ b/app/assets/javascripts/repository/utils/readme.js
@@ -1,21 +1,32 @@
-const MARKDOWN_EXTENSIONS = ['mdown', 'mkd', 'mkdn', 'md', 'markdown'];
-const ASCIIDOC_EXTENSIONS = ['adoc', 'ad', 'asciidoc'];
-const OTHER_EXTENSIONS = ['textile', 'rdoc', 'org', 'creole', 'wiki', 'mediawiki', 'rst'];
-const EXTENSIONS = [...MARKDOWN_EXTENSIONS, ...ASCIIDOC_EXTENSIONS, ...OTHER_EXTENSIONS];
-const PLAIN_FILENAMES = ['readme', 'index'];
-const FILE_REGEXP = new RegExp(
-  `^(${PLAIN_FILENAMES.join('|')})(.(${EXTENSIONS.join('|')}))?$`,
-  'i',
-);
-const PLAIN_FILE_REGEXP = new RegExp(`^(${PLAIN_FILENAMES.join('|')})`, 'i');
-const EXTENSIONS_REGEXP = new RegExp(`.(${EXTENSIONS.join('|')})$`, 'i');
+const FILENAMES = ['index', 'readme'];
 
-// eslint-disable-next-line import/prefer-default-export
-export const readmeFile = blobs => {
-  const readMeFiles = blobs.filter(f => f.name.search(FILE_REGEXP) !== -1);
+const MARKUP_EXTENSIONS = [
+  'ad',
+  'adoc',
+  'asciidoc',
+  'creole',
+  'markdown',
+  'md',
+  'mdown',
+  'mediawiki',
+  'mkd',
+  'mkdn',
+  'org',
+  'rdoc',
+  'rst',
+  'textile',
+  'wiki',
+];
 
-  const previewableReadme = readMeFiles.find(f => f.name.search(EXTENSIONS_REGEXP) !== -1);
-  const plainReadme = readMeFiles.find(f => f.name.search(PLAIN_FILE_REGEXP) !== -1);
+const isRichReadme = file => {
+  const re = new RegExp(`^(${FILENAMES.join('|')})\\.(${MARKUP_EXTENSIONS.join('|')})$`, 'i');
+  return re.test(file.name);
+};
 
-  return previewableReadme || plainReadme;
+const isPlainReadme = file => {
+  const re = new RegExp(`^(${FILENAMES.join('|')})$`, 'i');
+  return re.test(file.name);
 };
+
+// eslint-disable-next-line import/prefer-default-export
+export const readmeFile = blobs => blobs.find(isRichReadme) || blobs.find(isPlainReadme);
diff --git a/app/models/project_ci_cd_setting.rb b/app/models/project_ci_cd_setting.rb
index b292d39dae7..1dd65c76258 100644
--- a/app/models/project_ci_cd_setting.rb
+++ b/app/models/project_ci_cd_setting.rb
@@ -4,7 +4,6 @@ class ProjectCiCdSetting < ApplicationRecord
   include IgnorableColumns
   # https://gitlab.com/gitlab-org/gitlab/issues/36651
   ignore_column :merge_trains_enabled, remove_with: '12.7', remove_after: '2019-12-22'
-
   belongs_to :project, inverse_of: :ci_cd_settings
 
   # The version of the schema that first introduced this model/table.
diff --git a/app/services/spam_check_service.rb b/app/services/concerns/spam_check_methods.rb
index 51d300d4f1d..a0945857f89 100644
--- a/app/services/spam_check_service.rb
+++ b/app/services/concerns/spam_check_methods.rb
@@ -1,14 +1,14 @@
 # frozen_string_literal: true
 
-# SpamCheckService
+# SpamCheckMethods
 #
 # Provide helper methods for checking if a given spammable object has
 # potential spam data.
 #
 # Dependencies:
 # - params with :request
-#
-module SpamCheckService
+
+module SpamCheckMethods
   # rubocop:disable Gitlab/ModuleWithInstanceVariables
   def filter_spam_check_params
     @request            = params.delete(:request)
diff --git a/app/services/create_snippet_service.rb b/app/services/create_snippet_service.rb
index eacea7d94c7..56c175ebdb1 100644
--- a/app/services/create_snippet_service.rb
+++ b/app/services/create_snippet_service.rb
@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 class CreateSnippetService < BaseService
-  include SpamCheckService
+  include SpamCheckMethods
 
   def execute
     filter_spam_check_params
diff --git a/app/services/issues/create_service.rb b/app/services/issues/create_service.rb
index 8d1df0d87a7..e8879d4df66 100644
--- a/app/services/issues/create_service.rb
+++ b/app/services/issues/create_service.rb
@@ -2,7 +2,7 @@
 
 module Issues
   class CreateService < Issues::BaseService
-    include SpamCheckService
+    include SpamCheckMethods
     include ResolveDiscussions
 
     def execute
diff --git a/app/services/issues/update_service.rb b/app/services/issues/update_service.rb
index b98a4d2567f..68d1657d881 100644
--- a/app/services/issues/update_service.rb
+++ b/app/services/issues/update_service.rb
@@ -2,7 +2,7 @@
 
 module Issues
   class UpdateService < Issues::BaseService
-    include SpamCheckService
+    include SpamCheckMethods
 
     def execute(issue)
       handle_move_between_ids(issue)
diff --git a/app/services/update_snippet_service.rb b/app/services/update_snippet_service.rb
index ac7f8e9b1f5..d365e4e7b2b 100644
--- a/app/services/update_snippet_service.rb
+++ b/app/services/update_snippet_service.rb
@@ -1,7 +1,7 @@
 # frozen_string_literal: true
 
 class UpdateSnippetService < BaseService
-  include SpamCheckService
+  include SpamCheckMethods
 
   attr_accessor :snippet