DEV: reduce chrome compositing issues for sidebar (#36670)

awesomerobot · web-flow · commit 585840225f34 · 2025-12-12T15:36:36.000-05:00
Chrome wasn't liking the `all` transition on this and it was showing performance issues with `scrollbar-color` and `.sidebar-section-header-button` — this more specific transition style seems to avoid it. After this is merged, these will go away: <img width="333" alt="image" src="https://github.com/user-attachments/assets/eb4077ea-abf7-4ccf-aed1-72ad36dc2091" />
diff --git a/app/assets/stylesheets/common/base/sidebar-section.scss b/app/assets/stylesheets/common/base/sidebar-section.scss
@@ -23,7 +23,9 @@
         calc(var(--d-sidebar-row-horizontal-padding) / 3);
 
       .discourse-no-touch & {
-        transition: all 0.25s;
+        transition:
+          opacity 0.25s,
+          background 0.25s;
         opacity: 0;
 
         &:hover {
