change background of diff overview

fix content not resetting when discarded

app/assets/stylesheets/pages/repo.scss

@@ -229,6 +229,11 @@
   .vertical-center {
     min-height: auto;
   }
+
+  .monaco-diff-editor.vs .diffOverview,
+  .monaco-diff-editor.vs .diffViewport {
+    background-color: $white-light;
+  }
 }
 
 .multi-file-editor-holder {

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

@@ -153,4 +153,6 @@ export const discardFileChanges = ({ commit }, file) => {
   if (file.tempFile && file.opened) {
     commit(types.TOGGLE_FILE_OPEN, file);
   }
+
+  eventHub.$emit(`editor.update.model.content.${file.path}`, file.raw);
 };