Resolve "MR Refactor: Improve performance by setting v-once"

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

@@ -145,6 +145,7 @@ export default {
         @click.stop="handleToggle"
       />
       <a
+        v-once
         ref="titleWrapper"
         :href="titleLink"
         class="append-right-4"

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

@@ -189,6 +189,7 @@ export default {
       </button>
       <a
         v-if="lineNumber"
+        v-once
         :data-linenumber="lineNumber"
         :href="lineHref"
       >

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

@@ -117,14 +117,6 @@ export default {
 
 <template>
   <td
-    v-if="isContentLine"
-    :class="lineType"
-    class="line_content"
-    v-html="normalizedLine.richText"
-  >
-  </td>
-  <td
-    v-else
     :class="classNameMap"
   >
     <diff-line-gutter-content

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

@@ -94,11 +94,12 @@ export default {
       :is-hover="isHover"
       class="diff-line-num new_line"
     />
-    <diff-table-cell
+    <td
+      v-once
       :class="line.type"
-      :diff-file="diffFile"
-      :line="line"
-      :is-content-line="true"
-    />
+      class="line_content"
+      v-html="line.richText"
+    >
+    </td>
   </tr>
 </template>

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

@@ -113,17 +113,15 @@ export default {
       :diff-view-type="parallelDiffViewType"
       class="diff-line-num old_line"
     />
-    <diff-table-cell
+    <td
+      v-once
       :id="line.left.lineCode"
-      :diff-file="diffFile"
-      :line="line"
-      :is-content-line="true"
-      :line-position="linePositionLeft"
-      :line-type="parallelViewLeftLineType"
-      :diff-view-type="parallelDiffViewType"
+      :class="parallelViewLeftLineType"
       class="line_content parallel left-side"
       @mousedown.native="handleParallelLineMouseDown"
-    />
+      v-html="line.left.richText"
+    >
+    </td>
     <diff-table-cell
       :diff-file="diffFile"
       :line="line"
@@ -135,16 +133,14 @@ export default {
       :diff-view-type="parallelDiffViewType"
       class="diff-line-num new_line"
     />
-    <diff-table-cell
+    <td
+      v-once
       :id="line.right.lineCode"
-      :diff-file="diffFile"
-      :line="line"
-      :is-content-line="true"
-      :line-position="linePositionRight"
-      :line-type="line.right.type"
-      :diff-view-type="parallelDiffViewType"
+      :class="line.right.type"
       class="line_content parallel right-side"
       @mousedown.native="handleParallelLineMouseDown"
-    />
+      v-html="line.right.richText"
+    >
+    </td>
   </tr>
 </template>