Add integrity check after column cell storage is modified.

Change-Id: I8d2bd7616e0428e4e881ef0dc1012c4973e636a9

sc/inc/column.hxx

@@ -28,6 +28,14 @@
 #include <set>
 #include <vector>
 
+#define DEBUG_COLUMN_STORAGE 1
+
+#if DEBUG_COLUMN_STORAGE
+#ifdef NDEBUG
+#undef NDEBUG
+#endif
+#endif
+
 #include <mdds/multi_type_vector.hpp>
 #include <mdds/multi_type_vector_trait.hpp>
 

sc/source/core/data/column2.cxx

@@ -56,6 +56,13 @@
 
 #include <math.h>
 
+#if DEBUG_COLUMN_STORAGE
+#include "columniterator.hxx"
+#include <iostream>
+using std::cout;
+using std::endl;
+#endif
+
 // -----------------------------------------------------------------------
 
 // factor from font size to optimal cell height (text width)
@@ -1384,6 +1391,20 @@ SCROW ScColumn::FindNextVisibleRowWithContent(SCROW nRow, bool bForward) const
 
 void ScColumn::CellStorageModified()
 {
+#if DEBUG_COLUMN_STORAGE
+    ScColumnTextWidthIterator aIter(*this, 0, MAXROW);
+    for (; aIter.hasCell(); aIter.next())
+    {
+        SCROW nRow = aIter.getPos();
+        ScBaseCell* pCell = GetCell(nRow);
+        if (!pCell)
+        {
+            cout << "Cell and text width storages are out of sync!" << endl;
+            cout.flush();
+            abort();
+        }
+    }
+#endif
 }
 
 unsigned short ScColumn::GetTextWidth(SCROW nRow) const