remove hacky margin added to hide diff overview

added comment re. try/catch in dispose

app/assets/stylesheets/pages/repo.scss

@@ -706,7 +706,3 @@
 .ide-commit-new-branch {
   margin-left: 25px;
 }
-
-.ide-editor-diff {
-  margin-right: -30px;
-}

ee/app/assets/javascripts/ide/components/repo_editor.vue

@@ -20,9 +20,6 @@ export default {
     shouldHideEditor() {
       return this.activeFile && this.activeFile.binary && !this.activeFile.raw;
     },
-    ideClassName() {
-      return `ide-editor-${this.viewer}`;
-    },
   },
   watch: {
     activeFile(oldVal, newVal) {
@@ -141,7 +138,6 @@ export default {
   <div
     id="ide"
     class="blob-viewer-container blob-editor-container"
-    :class="ideClassName"
   >
     <div
       v-if="shouldHideEditor"

ee/app/assets/javascripts/ide/lib/editor.js

@@ -124,18 +124,14 @@ export default class Editor {
   dispose() {
     window.removeEventListener('resize', this.debouncedUpdate);
 
+    // catch any potential errors with disposing the error
+    // this is mainly for tests caused by elements not existing
     try {
       this.disposable.dispose();
 
-      // dispose main monaco instance
-      if (this.instance) {
-        this.instance = null;
-      }
+      this.instance = null;
     } catch (e) {
-      // dispose main monaco instance
-      if (this.instance) {
-        this.instance = null;
-      }
+      this.instance = null;
     }
   }