Harden tracker anchor detection for new comment layout

extension/content.js

@@ -309,17 +309,94 @@ function getTrackerInsertionAnchorInPost(postElement, buttonBar) {
   return anchor && anchor.parentElement === postElement ? anchor : null;
 }
 
+function hasCommentComposerSignal(node) {
+  if (!node || !node.querySelector) {
+    return false;
+  }
+
+  return Boolean(
+    node.querySelector(
+      'div[role="textbox"][contenteditable="true"], [role="textbox"][aria-label*="komment" i], [role="textbox"][aria-label*="comment" i], [role="textbox"][aria-placeholder*="komment" i], [role="textbox"][aria-placeholder*="comment" i]'
+    )
+  );
+}
+
+function countActionRoleSignals(node) {
+  if (!node || !node.querySelector) {
+    return 0;
+  }
+
+  const hasLike = Boolean(node.querySelector('[data-ad-rendering-role="like_button"], [data-ad-rendering-role*="gefällt" i]'));
+  const hasComment = Boolean(node.querySelector('[data-ad-rendering-role="comment_button"]'));
+  const hasShare = Boolean(node.querySelector('[data-ad-rendering-role="share_button"]'));
+
+  return [hasLike, hasComment, hasShare].filter(Boolean).length;
+}
+
+function isReliableActionBarCandidate(postElement, candidate) {
+  if (!postElement || !candidate || !candidate.isConnected || !postElement.contains(candidate)) {
+    return false;
+  }
+
+  if (candidate.closest('.fb-tracker-ui')) {
+    return false;
+  }
+
+  if (hasCommentComposerSignal(candidate)) {
+    return false;
+  }
+
+  const buttonCount = candidate.querySelectorAll('[role="button"], button').length;
+  if (buttonCount > 80) {
+    return false;
+  }
+
+  const actionRoleSignals = countActionRoleSignals(candidate);
+  if (actionRoleSignals >= 2) {
+    return true;
+  }
+
+  return hasInteractionButtons(candidate);
+}
+
+function findActionBarByDataRoles(postElement) {
+  if (!postElement) {
+    return null;
+  }
+
+  const markers = Array.from(postElement.querySelectorAll(
+    '[data-ad-rendering-role="like_button"], [data-ad-rendering-role*="gefällt" i], [data-ad-rendering-role="comment_button"], [data-ad-rendering-role="share_button"]'
+  ));
+
+  for (const marker of markers) {
+    let current = marker;
+    for (let depth = 0; depth < 8 && current && current !== postElement; depth++) {
+      if (isReliableActionBarCandidate(postElement, current)) {
+        return current;
+      }
+      current = current.parentElement;
+    }
+  }
+
+  return null;
+}
+
 function resolveActionButtonBar(postElement, buttonBar) {
   if (!postElement) {
     return null;
   }
 
-  if (buttonBar && buttonBar.isConnected && postElement.contains(buttonBar)) {
+  const dataRoleResolved = findActionBarByDataRoles(postElement);
+  if (dataRoleResolved) {
+    return dataRoleResolved;
+  }
+
+  if (buttonBar && isReliableActionBarCandidate(postElement, buttonBar)) {
     return buttonBar;
   }
 
   const resolved = findButtonBar(postElement);
-  if (resolved && resolved.isConnected && postElement.contains(resolved)) {
+  if (resolved && isReliableActionBarCandidate(postElement, resolved)) {
     return resolved;
   }
 
@@ -428,6 +505,29 @@ function findAdjacentCommentSortAnchor(postElement, actionAnchor = null) {
   return null;
 }
 
+function findCommentSortAnchorInPost(postElement) {
+  if (!postElement) {
+    return null;
+  }
+
+  const sortCandidates = Array.from(
+    postElement.querySelectorAll('[aria-label*="relevantes zuerst" i], [aria-label*="most relevant" i], [aria-label*="neueste" i], [aria-label*="newest" i], [role="button"], button')
+  );
+
+  for (const candidate of sortCandidates) {
+    if (!isLikelyCommentSortNode(candidate)) {
+      continue;
+    }
+
+    const topLevel = getTopLevelAnchorWithinPost(postElement, candidate) || candidate;
+    if (topLevel && topLevel.parentElement && postElement.contains(topLevel)) {
+      return topLevel;
+    }
+  }
+
+  return null;
+}
+
 function createTrackerInsertionMarker() {
   const marker = document.createElement('div');
   marker.className = 'fb-tracker-insertion-anchor';
@@ -472,6 +572,14 @@ function positionTrackerInsertionMarker(postElement, marker, buttonBar, postNum
     return true;
   }
 
+  const fallbackSortAnchor = findCommentSortAnchorInPost(postElement);
+  if (fallbackSortAnchor && fallbackSortAnchor.parentElement) {
+    fallbackSortAnchor.parentElement.insertBefore(marker, fallbackSortAnchor);
+    setTrackerInsertionMarkerLocked(marker, true);
+    console.log('[FB Tracker] Post #' + postNum + ' - Marker fallback inserted before comment sort');
+    return true;
+  }
+
   postElement.appendChild(marker);
   setTrackerInsertionMarkerLocked(marker, false);
   console.log('[FB Tracker] Post #' + postNum + ' - Marker fallback appended to post');