Added fix for #2240 (#2245)

Author: OssianEPPlus

src/EPPlus/Style/HeaderFooterTextFormat/ExcelHeaderFooterTextCollection.cs

@@ -645,8 +645,9 @@ internal void ReadHeaderFooterFormat(string hfText)
                         if (hfText[i] == '+' || hfText[i] == '-')
                         {
                             temp.PageNumberSuffix += hfText[i];
+                            i++;
                         }
-                        i++;
+
                         while (char.IsDigit( hfText[i]))
                         {
                             temp.PageNumberSuffix += hfText[i];

src/EPPlusTest/Issues/WorksheetIssues.cs

@@ -1049,5 +1049,15 @@ public void issue2191()
 
             Assert.AreEqual("B2", dbv.Address);
         }
+        [TestMethod]
+        public void i2240()
+        {
+            using (var package = OpenTemplatePackage("i2240.xlsx"))
+            {
+                var theText = package.Workbook.Worksheets.First().HeaderFooter.OddFooter.LeftAlignedText;
+
+                SaveAndCleanup(package);
+            }
+        }
     }
 }