fix search marker issues - splitting of items with stored rel search markers

src/types/AbstractType.js

@@ -77,6 +77,10 @@ export const useSearchMarker = (tr, yarray, index, f) => {
     }
     fsm.rel = 0
   }
+  if (fsm.rel > 0) {
+    fsm.index -= fsm.rel
+    fsm.rel = 0
+  }
   if (!createFreshMarker) {
     // reused old marker and we moved to a different position
     prevItem.marker = false

src/utils/ListIterator.js

@@ -289,6 +289,9 @@ export class ListIterator {
     const startLength = len
     const sm = this.type._searchMarker
     let item = this.nextItem
+    if (this.index + len > this.type._length) {
+      throw lengthExceeded
+    }
     while (len > 0) {
       while (item && !item.deleted && item.countable && !this.reachedEnd && len > 0 && item.moved === this.currMove && item !== this.currMoveEnd) {
         if (this.rel > 0) {