Implement Curve#remove() and Path#reduce().

Also have Item#reduce() recursively call #reduce() on reduced children.

src/item/Item.js

@@ -2064,7 +2064,7 @@ var Item = Base.extend(Callback, /** @lends Item# */{
 	 */
 	reduce: function() {
 		if (this._children && this._children.length === 1) {
-			var child = this._children[0];
+			var child = this._children[0].reduce();
 			child.insertAbove(this);
 			child.setStyle(this._style);
 			this.remove();

src/path/Curve.js

@@ -267,8 +267,12 @@ var Curve = Base.extend(/** @lends Curve# */{
 	 * @bean
 	 */
 	getLength: function() {
-		if (this._length == null)
-			this._length = Curve.getLength(this.getValues(), 0, 1);
+		if (this._length == null) {
+			// Use simple point distance for linear curves
+			this._length = this.isLinear()
+				? this._segment2._point.getDistance(this._segment1._point)
+				: Curve.getLength(this.getValues(), 0, 1);
+		}
 		return this._length;
 	},
 
@@ -303,16 +307,6 @@ var Curve = Base.extend(/** @lends Curve# */{
 
 	// TODO: adjustThroughPoint
 
-	/**
-	 * Returns a reversed version of the curve, without modifying the curve
-	 * itself.
-	 *
-	 * @return {Curve} a reversed version of the curve
-	 */
-	reverse: function() {
-		return new Curve(this._segment2.reverse(), this._segment1.reverse());
-	},
-
 	/**
 	 * Private method that handles all types of offset / isParameter pairs and
 	 * converts it to a curve parameter.
@@ -418,6 +412,33 @@ var Curve = Base.extend(/** @lends Curve# */{
 			: null;
 	},
 
+	/**
+	 * Returns a reversed version of the curve, without modifying the curve
+	 * itself.
+	 *
+	 * @return {Curve} a reversed version of the curve
+	 */
+	reverse: function() {
+		return new Curve(this._segment2.reverse(), this._segment1.reverse());
+	},
+
+	/**
+	 * Removes the curve from the path that it belongs to, by merging its two
+	 * path segments.
+	 * @return {Boolean} {@true if the curve was removed}
+	 */
+	remove: function() {
+		var removed = false;
+		if (this._path) {
+			var segment2 = this._segment2,
+				handleOut = segment2._handleOut;
+			removed = segment2.remove();
+			if (removed)
+				this._segment1._handleOut.set(handleOut.x, handleOut.y);
+		}
+		return removed;
+	},
+
 	/**
 	 * Returns a copy of the curve.
 	 *

src/path/Path.js

@@ -900,6 +900,19 @@ var Path = PathItem.extend(/** @lends Path# */{
 		this.setSegments(segments);
 	},
 
+	/**
+	 * Reduces the path by removing curves that have a lenght of 0.
+	 */
+	reduce: function() {
+		var curves = this.getCurves();
+		for (var i = curves.length - 1; i >= 0; i--) {
+			var curve = curves[i];
+			if (curve.isLinear() && curve.getLength() === 0)
+				curve.remove();
+		}
+		return this;
+	},
+
 	/**
 	 * Smooths a path by simplifying it. The {@link Path#segments} array is
 	 * analyzed and replaced by a more optimal set of segments, reducing memory