Add convenience methods to increase and decrease widths of rectangle in chain

Autoported commit.
Original commit hash: [e83df626e]

Author: Snipx

itext.tests/itext.kernel.tests/itext/kernel/geom/RectangleTest.cs

@@ -611,5 +611,19 @@ public virtual void CloneTest() {
             NUnit.Framework.Assert.AreEqual(typeof(PageSize), copyAsPageSize.GetType());
             NUnit.Framework.Assert.AreEqual(typeof(PageSize), copyAsRectangle.GetType());
         }
+
+        [NUnit.Framework.Test]
+        public virtual void DecreaseWidthTest() {
+            Rectangle rectangle = new Rectangle(100, 200);
+            rectangle.DecreaseWidth(10);
+            NUnit.Framework.Assert.AreEqual(90, rectangle.GetWidth(), Rectangle.EPS);
+        }
+
+        [NUnit.Framework.Test]
+        public virtual void IncreaseWidthTest() {
+            Rectangle rectangle = new Rectangle(100, 200);
+            rectangle.IncreaseWidth(10);
+            NUnit.Framework.Assert.AreEqual(110, rectangle.GetWidth(), Rectangle.EPS);
+        }
     }
 }

itext/itext.kernel/itext/kernel/geom/Rectangle.cs

@@ -51,7 +51,7 @@ source product.
 namespace iText.Kernel.Geom {
     /// <summary>Class that represent rectangle object.</summary>
     public class Rectangle {
-        private static float EPS = 1e-4f;
+        internal static float EPS = 1e-4f;
 
         protected internal float x;
 
@@ -412,6 +412,32 @@ public virtual iText.Kernel.Geom.Rectangle DecreaseHeight(float extra) {
             return this;
         }
 
+        /// <summary>Increases the width of rectangle by the given value.</summary>
+        /// <remarks>Increases the width of rectangle by the given value. May be used in chain.</remarks>
+        /// <param name="extra">the value of the extra wudth to be added.</param>
+        /// <returns>
+        /// this
+        /// <see cref="Rectangle"/>
+        /// instance.
+        /// </returns>
+        public virtual iText.Kernel.Geom.Rectangle IncreaseWidth(float extra) {
+            this.width += extra;
+            return this;
+        }
+
+        /// <summary>Decreases the width of rectangle by the given value.</summary>
+        /// <remarks>Decreases the width of rectangle by the given value. May be used in chain.</remarks>
+        /// <param name="extra">the value of the extra width to be subtracted.</param>
+        /// <returns>
+        /// this
+        /// <see cref="Rectangle"/>
+        /// instance.
+        /// </returns>
+        public virtual iText.Kernel.Geom.Rectangle DecreaseWidth(float extra) {
+            this.width -= extra;
+            return this;
+        }
+
         /// <summary>Gets the X coordinate of the left edge of the rectangle.</summary>
         /// <remarks>
         /// Gets the X coordinate of the left edge of the rectangle. Same as:

port-hash

@@ -1 +1 @@
-f895f395b8dda88bfd0c4a4fa669683268ba2742
+e83df626e1a8ca26e1bc0e8b03a54d3dc9110cf0