Fixes issue 2392

src/EPPlus/Core/ChangableDictionary.cs

@@ -59,14 +59,15 @@ internal T this[int key]
 
         internal virtual void InsertAndShift(int fromPosition, int add)
         {
+            if (_count == 0) return;
             var pos = Array.BinarySearch(_index[0], 0, _count, fromPosition);
 
             if (pos < 0)
             {
                 pos = ~pos;
             }
 
-            if (_count >= _index[0].Length - 1)
+            if (_count >= _index[0].Length-1)
             {
                 Array.Resize(ref _index[0], _index[0].Length << 1);
                 Array.Resize(ref _index[1], _index[1].Length << 1);
@@ -83,6 +84,23 @@ internal virtual void InsertAndShift(int fromPosition, int add)
             }
             Version++;
         }
+        internal virtual void Shift(int fromPosition, int add)
+        {
+            if (_count == 0) return;
+            var pos = Array.BinarySearch(_index[0], 0, _count, fromPosition);
+
+            if (pos < 0)
+            {
+                pos = ~pos;
+            }
+            if (pos >= _count) return;
+
+            for (int i = pos; i < Count; i++)
+            {
+                _index[0][i] += add;
+            }
+            Version++;
+        }
 
         internal int Count { get { return _count; } }
         /// <summary>

src/EPPlus/Core/Worksheet/WorksheetRangeInsertHelper.cs

@@ -706,6 +706,9 @@ private static void AdjustColumns(ExcelWorksheet ws, int columnFrom, int columns
                 }
             }
 
+            //Shift column indexes from columnFrom
+            ws.ColumnLookup.Shift(columnFrom, columns);
+
             for (int i = lst.Count - 1; i >= 0; i--)
             {
                 var c = lst[i];

src/EPPlus/Drawing/ExcelDrawing.cs

@@ -15,6 +15,7 @@ Date               Author                       Change
 using OfficeOpenXml.Drawing.Controls;
 using OfficeOpenXml.Drawing.OleObject;
 using OfficeOpenXml.Drawing.Slicer;
+using OfficeOpenXml.FormulaParsing.Excel.Functions.Text;
 using OfficeOpenXml.Packaging;
 using OfficeOpenXml.Utils.Drawings;
 using OfficeOpenXml.Utils.EnumUtils;
@@ -344,18 +345,7 @@ public virtual string Name
                         // All uniqueness checks successfully passed! Safe to update name-lookup dictionaries.
                         UpdateNameInDictionaries(oldName, value);
                     }
-
-                    SetXmlNodeString(_nvPrPath + "/@name", value);
-                    if (this is ExcelSlicer<ExcelTableSlicerCache> ts)
-                    {
-                        SetXmlNodeString(_nvPrPath + "/../../a:graphic/a:graphicData/sle:slicer/@name", value);
-                        ts.SlicerName = value;
-                    }
-                    else if (this is ExcelSlicer<ExcelPivotTableSlicerCache> pts)
-                    {
-                        SetXmlNodeString(_nvPrPath + "/../../a:graphic/a:graphicData/sle:slicer/@name", value);
-                        pts.SlicerName = value;
-                    }
+                    SetName(value);
                 }
                 catch (ArgumentException)
                 {
@@ -367,6 +357,20 @@ public virtual string Name
                 }
             }
         }
+        internal void SetName(string name)
+        {
+            SetXmlNodeString(_nvPrPath + "/@name", name);
+            if (this is ExcelSlicer<ExcelTableSlicerCache> ts)
+            {
+                SetXmlNodeString(_nvPrPath + "/../../a:graphic/a:graphicData/sle:slicer/@name", name);
+                ts.SlicerName = name;
+            }
+            else if (this is ExcelSlicer<ExcelPivotTableSlicerCache> pts)
+            {
+                SetXmlNodeString(_nvPrPath + "/../../a:graphic/a:graphicData/sle:slicer/@name", name);
+                pts.SlicerName = name;
+            }
+        }
 
 
         /// <summary>
@@ -1719,6 +1723,10 @@ public void UnGroup(bool ungroupThisItemOnly = true)
             }
             else
             {
+                foreach (var item in _parent.Drawings)
+                {
+                    _drawings.AddDrawingInternal(item);
+                }
                 _parent.Drawings.Clear();
             }
             if (prevParent.Drawings.Count <= 0)
@@ -2485,7 +2493,7 @@ private XmlNode CopyShape(ExcelChartStandard targetChart, bool isGroupShape = fa
                 drawNode.InnerXml = TopNode.InnerXml;
                 var targetShape = GetDrawing(targetChart.Drawings._drawings, drawNode, DrawingsCollectionType.Chart) as ExcelShape;
                 targetShape.Id = ++targetChart.Drawings._nextDrawingId;
-                targetShape.Name = targetChart.Drawings.GetUniqueDrawingName(this.Name);
+                targetShape.SetName(targetChart.Drawings.GetUniqueDrawingName(this.Name));
             }
             return drawNode;
         }

src/EPPlus/Drawing/ExcelDrawings.cs

@@ -208,6 +208,7 @@ internal string GetUniqueDrawingName(string name)
         {
             var newName = name;
             var index = 1;
+
             while (_drawingNames.ContainsKey(newName))
             {
                 var split = newName.Split(' ');

src/EPPlus/Drawing/ExcelShape.cs

@@ -10,6 +10,7 @@ Date               Author                       Change
  *************************************************************************************************
   01/27/2020         EPPlus Software AB       Initial release EPPlus 5
  *************************************************************************************************/
+using System;
 using System.Text;
 using System.Xml;
 using OfficeOpenXml.Drawing.Interfaces;
@@ -89,5 +90,6 @@ internal override void DeleteMe()
             }
             base.DeleteMe();
         }
+
     }
 }

src/EPPlus/ExcelWorksheet.cs

@@ -2275,7 +2275,7 @@ public void InsertColumn(int columnFrom, int columns)
         public void InsertColumn(int columnFrom, int columns, int copyStylesFromColumn)
         {
             WorksheetRangeInsertHelper.InsertColumn(this, columnFrom, columns, copyStylesFromColumn);
-            ColumnLookup.InsertAndShift(columnFrom, columns);
+            //ColumnLookup.InsertAndShift(columnFrom, columns);
         }
         #endregion
         #region DeleteRow