Bugfix in CssLayoutEngine.ApplyCenterAlignment and CssLayoutEngine.ApplyRightAlignment where in certain situations an exception was thrown instead of applying the alignment due to reversed lookup.

Author: configurator

Source/HtmlRenderer/Core/Dom/CssLayoutEngine.cs

@@ -624,10 +624,10 @@ private static void ApplyCenterAlignment(RGraphics g, CssLineBox line)
                     word.Left += diff;
                 }
 
-                foreach (CssBox b in line.Rectangles.Keys)
+                foreach (CssBox b in ToList(line.Rectangles.Keys))
                 {
-                    RRect r = b.Rectangles[line];
-                    b.Rectangles[line] = new RRect(r.X + diff, r.Y, r.Width, r.Height);
+                    RRect r = line.Rectangles[b];
+                    line.Rectangles[b] = new RRect(r.X + diff, r.Y, r.Width, r.Height);
                 }
             }
         }
@@ -654,10 +654,10 @@ private static void ApplyRightAlignment(RGraphics g, CssLineBox line)
                     word.Left += diff;
                 }
 
-                foreach (CssBox b in line.Rectangles.Keys)
+                foreach (CssBox b in ToList(line.Rectangles.Keys))
                 {
-                    RRect r = b.Rectangles[line];
-                    b.Rectangles[line] = new RRect(r.X + diff, r.Y, r.Width, r.Height);
+                    RRect r = line.Rectangles[b];
+                    line.Rectangles[b] = new RRect(r.X + diff, r.Y, r.Width, r.Height);
                 }
             }
         }
@@ -687,6 +687,16 @@ private static void ApplyLeftAlignment(RGraphics g, CssLineBox line)
             //}
         }
 
+        private static List<T> ToList<T>(IEnumerable<T> collection)
+        {
+            List<T> result = new List<T>();
+            foreach (T item in collection)
+            {
+                result.Add(item);
+            }
+            return result;
+        }
+
         #endregion
     }
 }