fix(EPPlus): DoAdjustDrawings ship-blocker 在 3 处切换点补完

d54ef9d 修了 ExportHelper.AddPictures 一处 DoAdjustDrawings=false 切换,
但全 EPPlus 还有 3 处同样缺 try/finally:
  - ExcelRangeBase.AutoFitColumns (字体测量循环)
  - ExcelWorksheet.CreateXml (加载 xlsx xml)
  - ExcelWorksheets.CloneCells (worksheet 拷贝)

任一处抛未捕获异常都会让 flag 永久卡在 false, 后续
Row.Height / Column.Width / Column.Hidden setter 不重算 drawings,
图片位置错乱.

修复: 用 try/finally 包裹原赋值, finally 恢复 prevDoAdjust.

验证: DrawingsFlush 4/4, ExcelExporter 36/36, XSSF 34/34,
ImageOptimization 25/25, 共 100 测试通过.

Author: hueifeng

src/EPPlus/EPPlus/ExcelRangeBase.cs

@@ -868,6 +868,8 @@ public void AutoFitColumns(double minimumWidth, double maximumWidth)
 
             bool doAdjust = _worksheet._package.DoAdjustDrawings;
             _worksheet._package.DoAdjustDrawings = false;
+            try
+            {
             var drawWidths = _worksheet.Drawings.GetDrawingWidths();
 
             var fromCol = _fromCol > _worksheet.Dimension._fromCol ? _fromCol : _worksheet.Dimension._fromCol;
@@ -1003,7 +1005,6 @@ public void AutoFitColumns(double minimumWidth, double maximumWidth)
                 }
 
                 _worksheet.Drawings.AdjustWidth(drawWidths);
-                _worksheet._package.DoAdjustDrawings = doAdjust;
             }
             finally
             {
@@ -1014,6 +1015,11 @@ public void AutoFitColumns(double minimumWidth, double maximumWidth)
                     tf?.Dispose();
                 fallbackFont?.Dispose();
             }
+            }
+            finally
+            {
+                _worksheet._package.DoAdjustDrawings = doAdjust;
+            }
         }
 
         private SKFont GetAvailableFont(string text,

src/EPPlus/EPPlus/ExcelWorksheet.cs

@@ -874,6 +874,8 @@ private void CreateXml()
             // First Columns, rows, cells, mergecells, hyperlinks and pagebreakes are loaded from a xmlstream to optimize speed...
             bool doAdjust = _package.DoAdjustDrawings;
             _package.DoAdjustDrawings = false;
+            try
+            {
             Stream stream = packPart.GetStream();
 
 #if Core
@@ -907,7 +909,11 @@ private void CreateXml()
             else
                 LoadXmlSafe(_worksheetXml, xml, encoding);
 
-            _package.DoAdjustDrawings = doAdjust;
+            }
+            finally
+            {
+                _package.DoAdjustDrawings = doAdjust;
+            }
             ClearNodes();
         }
         /// <summary>

src/EPPlus/EPPlus/ExcelWorksheets.cs

@@ -526,6 +526,8 @@ private void CloneCells(ExcelWorksheet Copy, ExcelWorksheet added)
 
             bool doAdjust = _pck.DoAdjustDrawings;
             _pck.DoAdjustDrawings = false;
+            try
+            {
             //Merged cells
             foreach (var r in Copy.MergedCells)     //Issue #94
             {
@@ -586,7 +588,11 @@ private void CloneCells(ExcelWorksheet Copy, ExcelWorksheet added)
                     }
                 }
             }
-            added._package.DoAdjustDrawings = doAdjust;
+            }
+            finally
+            {
+                added._package.DoAdjustDrawings = doAdjust;
+            }
         }
 
         private int CopyValues(ExcelWorksheet Copy, ExcelWorksheet added, int row, int col)