fix(comments): emit empty comment positions so undo clears orphan bubbles

PresentationEditor skipped emission when positions were empty, so undoing
the last tracked-change mark never signaled the store to clear stale data.
Also fix getFloatingComments to use isEditorBackedComment() so tracked-change
comments (which lack selection.source) require live positions like editor comments.

Author: caio-pizzol

packages/super-editor/src/core/presentation-editor/PresentationEditor.ts

@@ -3524,14 +3524,12 @@ export class PresentationEditor extends EventEmitter {
       this.emit('paginationUpdate', payload);
 
       // Emit fresh comment positions after layout completes.
-      // This ensures positions are always in sync with the current document and layout.
+      // Always emit — even when empty — so the store can clear stale positions
+      // (e.g. when undo removes the last tracked-change mark).
       const allowViewingCommentPositions = this.#layoutOptions.emitCommentPositionsInViewing === true;
       if (this.#documentMode !== 'viewing' || allowViewingCommentPositions) {
         const commentPositions = this.#collectCommentPositions();
-        const positionKeys = Object.keys(commentPositions);
-        if (positionKeys.length > 0) {
-          this.emit('commentPositions', { positions: commentPositions });
-        }
+        this.emit('commentPositions', { positions: commentPositions });
       }
 
       this.#selectionSync.requestRender({ immediate: true });

packages/superdoc/src/stores/comments-store.js

@@ -876,11 +876,12 @@ export const useCommentsStore = defineStore('comments', () => {
     const comments = getGroupedComments.value?.parentComments
       .filter((c) => !c.resolvedTime)
       .filter((c) => {
-        const keys = Object.keys(editorCommentPositions.value);
-        const isPdfComment = c.selection?.source !== 'super-editor';
-        if (isPdfComment) return true;
+        // Non-editor comments (e.g. PDF) are always shown.
+        // Editor-backed comments (including tracked changes, which have no
+        // selection.source) must have a live position in the document.
+        if (!isEditorBackedComment(c)) return true;
         const commentKey = c.commentId || c.importedId;
-        return keys.includes(commentKey);
+        return Object.keys(editorCommentPositions.value).includes(commentKey);
       });
     return comments;
   });

packages/superdoc/src/stores/comments-store.test.js

@@ -946,5 +946,24 @@ describe('comments-store', () => {
       const floating = store.getFloatingComments;
       expect(floating).toEqual([]);
     });
+
+    it('excludes unresolved tracked change when positions are cleared (regression: SD-2071)', () => {
+      store.commentsList = [
+        { commentId: 'tc-1', trackedChange: true, resolvedTime: null, createdTime: 1, selection: {} },
+      ];
+      // Undo removed the mark — positions are now empty
+      store.editorCommentPositions = {};
+
+      const floating = store.getFloatingComments;
+      expect(floating).toEqual([]);
+    });
+
+    it('keeps PDF comments visible when editor positions are empty (SD-2071)', () => {
+      store.commentsList = [{ commentId: 'pdf-1', createdTime: 1, selection: { source: 'pdf', selectionBounds: {} } }];
+      store.editorCommentPositions = {};
+
+      const floating = store.getFloatingComments;
+      expect(floating.map((c) => c.commentId)).toEqual(['pdf-1']);
+    });
   });
 });