Merge branch 'alai/37360-sidebarBug' into 'master'

Sidebar getting partially hidden behind the content block

See merge request gitlab-org/gitlab!21978

app/assets/stylesheets/pages/issuable.scss

@@ -288,7 +288,7 @@
   }
 
   .issuable-sidebar {
-    width: calc(100% + 100px);
+    width: 100%;
     height: 100%;
     overflow-y: scroll;
     overflow-x: hidden;

changelogs/unreleased/alai-37360-sidebarBug.yml

+---
+title: Sidebar getting partially hidden behind the content block
+merge_request: 21978
+author: allenlai18
+type: fixed