fix autoscroll

vue/src/composables/useFeeds.js

@@ -200,13 +200,9 @@ function setupIntersectionObserver() {
   }
 }
 
-async function handleIntersection(entries, topbarHeight = 0) {
-  // An article that has scrolled past the (possibly sticky-bar-shrunk) top
-  // edge of the viewport (not intersecting, bounding box above that edge)
-  // has been read. Resolve all affected feeds up front, before any removal —
-  // splicing `feeds` while iterating would shift the array indices that later
-  // entries' `target.id` refer to, causing the wrong item to be marked read
-  // and removed.
+function handleIntersection(entries, topbarHeight = 0) {
+  // Resolve all affected feeds before touching feeds.value — the target.id
+  // indices are render-time positions that shift once we splice the array.
   const readFeeds = entries
     .filter(entry => initialLoad === true && !entry.isIntersecting && entry.boundingClientRect.y < topbarHeight)
     .map(entry => feeds.value[entry.target.id])
@@ -214,22 +210,38 @@ async function handleIntersection(entries, topbarHeight = 0) {
 
   if (readFeeds.length === 0) return
 
-  for (const feed of readFeeds) {
-    await markRead(feed.id)
+  // Disconnect before the DOM mutation. In card layout the cards are short
+  // enough that the shift caused by removing one can push the next card above
+  // the header, which the observer would immediately treat as another read —
+  // cascading until many articles disappear at once.
+  if (observer) {
+    observer.disconnect()
+    observer = null
   }
 
   const readIds = new Set(readFeeds.map(feed => feed.id))
   feeds.value = feeds.value.filter(feed => !readIds.has(feed.id))
-  // Removing .observe nodes that have already scrolled above the viewport
-  // shrinks the document above the current scroll position — native CSS
-  // scroll anchoring (on by default, no overflow-anchor override here)
-  // compensates for that automatically by keeping the visually-anchored
-  // node in place. Do NOT add a scrollIntoView()/scrollTo() here: an
-  // earlier version called `document.getElementById(0)?.scrollIntoView()`
-  // to fix a past scroll-jump complaint, but by the time several articles
-  // have been read, id "0" is an already-read element far above the
-  // viewport — forcing a jump to it fights scroll anchoring and is exactly
-  // the stutter being fixed now.
+
+  for (const feed of readFeeds) {
+    markRead(feed.id)
+  }
+
+  nextTick().then(() => {
+    // If scroll anchoring didn't compensate for the removed content (common
+    // with position:fixed headers and overflow-x:hidden on body), the first
+    // remaining article will have drifted above the header. Correct the scroll
+    // position so it sits exactly at the header bottom before reconnecting —
+    // otherwise the initial observation would immediately mark everything above
+    // the topbar as read and cascade until the list is empty.
+    const first = document.querySelector('.observe')
+    if (first) {
+      const top = first.getBoundingClientRect().top
+      if (top < topbarHeight) {
+        window.scrollBy(0, top - topbarHeight)
+      }
+    }
+    setupIntersectionObserver()
+  })
 }
 
 function setInitialLoad(value) {
@@ -295,6 +307,7 @@ async function toggleLayout() {
     observer.disconnect()
     observer = null
   }
+  window.scrollTo(0, 0)
   layout.value = layout.value === 'list' ? 'cards' : 'list'
   localStorage.setItem('layout', layout.value)
   await nextTick()