add PreferredHeight from TextBoxBase open source code

remove kludge that was GetSuggestedHeight()

source/IPAddressControl.cs

@@ -201,6 +201,23 @@ public override Size MinimumSize
       get { return CalculateMinimumSize(); }
     }
 
+    [Browsable(false), EditorBrowsable(EditorBrowsableState.Advanced),
+        DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
+    public int PreferredHeight
+    {
+      get
+      {
+        int height = FontHeight;
+
+        if (BorderStyle != BorderStyle.None)
+        {
+          height += SystemInformation.BorderSize.Height * 4 + 3;
+        }
+
+        return height;
+      }
+    }
+
     [Browsable(true)]
     public bool ReadOnly
     {
@@ -597,11 +614,11 @@ private Size CalculateMinimumSize()
       {
         case BorderStyle.Fixed3D:
           minimumSize.Width += 6;
-          minimumSize.Height += (GetSuggestedHeight() - minimumSize.Height);
+          minimumSize.Height += (PreferredHeight - minimumSize.Height);
           break;
         case BorderStyle.FixedSingle:
           minimumSize.Width += 4;
-          minimumSize.Height += (GetSuggestedHeight() - minimumSize.Height);
+          minimumSize.Height += (PreferredHeight - minimumSize.Height);
           break;
       }
 
@@ -626,19 +643,6 @@ private void Cleanup()
       _fieldControls = null;
     }
 
-    private int GetSuggestedHeight()
-    {
-      int height = 0;
-      using (TextBox reference = new TextBox())
-      {
-        reference.AutoSize = true;
-        reference.BorderStyle = BorderStyle;
-        reference.Font = Font;
-        height = reference.Height;
-      }
-      return height;
-    }
-
     [System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Usage", "CA1806", Justification = "What should be done if ReleaseDC() doesn't work?")]
     private static NativeMethods.Textmetric GetTextMetrics(IntPtr hwnd, Font font)
     {