pathetic sein father

public/s/js/sidebar-activity.js

@@ -665,11 +665,15 @@
         //      still need a re-check after load (handled by attachMediaLoadListeners).
         //   2. Any mis-estimates: content that the heuristic got wrong is corrected
         //      after layout so measurements are accurate.
-        requestAnimationFrame(() => {
+        // Run checkOverflow synchronously immediately after setting innerHTML.
+        // This forces a synchronous layout (reflow) but guarantees the browser
+        // will not paint the intermediate state, completely eliminating any "flash"
+        // of the button popping in or out.
         checkOverflow();
-            // After 1s, re-check everything — by then even slow ctrl+F5 images will
+
-            // have loaded and been laid out, so scrollHeight is accurate for all
+        // checkOverflow still runs deferred to handle image loads (attachMediaLoadListeners)
-            // image comments.
+        // and a fallback 1s timeout for any incredibly slow layout edge cases.
+        requestAnimationFrame(() => {
             setTimeout(checkOverflow, 1000);
         });
         fetchSidebarYoutubeTitles(container);
@@ -795,8 +799,8 @@
                         playSidebarEmojiVideos(node);
                     });
                     // Defer overflow checks to after layout so measurements are accurate.
-                    requestAnimationFrame(() => {
                     addedNodes.forEach(node => checkOverflow(node));
+                    requestAnimationFrame(() => {
                         // Deferred re-check for image comments — mirrors renderFromCache behaviour.
                         // Images in newly appended nodes may not be laid out yet at append time.
                         setTimeout(() => addedNodes.forEach(node => checkOverflow(node)), 1000);
@@ -869,7 +873,7 @@
                 node.classList.add('new-item-fade');
                 container.prepend(node);
                 attachMediaLoadListeners(node);
-                requestAnimationFrame(() => checkOverflow(node));
+                checkOverflow(node);
                 fetchSidebarYoutubeTitles(container);
                 playSidebarEmojiVideos(node);
             }