Calculate row range for a single-row AutoFilter range

src/PhpSpreadsheet/Worksheet/AutoFilter.php

@@ -1033,6 +1033,8 @@ public function showHideRows()
             }
         }
 
+        $rangeEnd[1] = $this->checkAutoExtendRange($rangeStart[1], $rangeEnd[1]);
+
         //    Execute the column tests for each row in the autoFilter range to determine show/hide,
         for ($row = $rangeStart[1] + 1; $row <= $rangeEnd[1]; ++$row) {
             $result = true;
@@ -1055,6 +1057,24 @@ public function showHideRows()
         return $this;
     }
 
+    /**
+     * Magic Range Auto-sizing.
+     * For a single row rangeSet, we follow MS Excel rules, and search for the first empty row to determine our range.
+     */
+    protected function checkAutoExtendRange(int $startRow, int $endRow): int
+    {
+        if ($startRow === $endRow && $this->workSheet !== null) {
+            $rowIterator = $this->workSheet->getRowIterator($startRow + 1);
+            foreach ($rowIterator as $row) {
+                if ($row->isEmpty(CellIterator::TREAT_NULL_VALUE_AS_EMPTY_CELL | CellIterator::TREAT_EMPTY_STRING_AS_EMPTY_CELL) === true) {
+                    return $row->getRowIndex() - 1;
+                }
+            }
+        }
+
+        return $endRow;
+    }
+
     /**
      * Implement PHP __clone to create a deep clone, not just a shallow copy.
      */