Enabled text selection in diffs in Web IDE

Resolves https://gitlab.com/gitlab-org/gitlab-ce/issues/47771

Changelog entry

app/assets/stylesheets/page_bundles/ide.scss

@@ -179,6 +179,14 @@ $ide-commit-header-height: 48px;
     display: none;
   }
 
+  .monaco-editor .selected-text {
+    z-index: 1;
+  }
+
+  .monaco-editor .view-lines {
+    z-index: 2;
+  }
+
   .is-readonly,
   .editor.original {
     .view-lines {

changelogs/unreleased/47771-highlighting-in-diff.yml

+---
+title: Enabled text selection highlighting in diffs in Web IDE
+merge_request: 26721
+author: Isaac Smith
+type: fixed