Prevent diff spans from overgrowing the container

app/assets/stylesheets/pages/diff.scss

@@ -446,7 +446,7 @@ table.code {
     vertical-align: top;
 
     span {
-      white-space: pre-wrap;
+      white-space: break-spaces;
 
       &.context-cell {
         display: inline-block;

changelogs/unreleased/andr3-218471-code-review-diff-overlaps-sidebar.yml

+---
+title: Fix whitespace changes overgrowing the diff container
+merge_request: 32774
+author:
+type: fixed