[ts] Fixed incorrect calculation in AnimationState when expanding the tracks array. Closes #1360.

spine-ts/build/spine-all.js

@@ -1755,7 +1755,7 @@ var spine;
 		AnimationState.prototype.expandToIndex = function (index) {
 			if (index < this.tracks.length)
 				return this.tracks[index];
-			spine.Utils.ensureArrayCapacity(this.tracks, index - this.tracks.length + 1, null);
+			spine.Utils.ensureArrayCapacity(this.tracks, index + 1, null);
 			this.tracks.length = index + 1;
 			return null;
 		};

spine-ts/build/spine-canvas.js

@@ -1755,7 +1755,7 @@ var spine;
 		AnimationState.prototype.expandToIndex = function (index) {
 			if (index < this.tracks.length)
 				return this.tracks[index];
-			spine.Utils.ensureArrayCapacity(this.tracks, index - this.tracks.length + 1, null);
+			spine.Utils.ensureArrayCapacity(this.tracks, index + 1, null);
 			this.tracks.length = index + 1;
 			return null;
 		};

spine-ts/build/spine-core.js

@@ -1755,7 +1755,7 @@ var spine;
 		AnimationState.prototype.expandToIndex = function (index) {
 			if (index < this.tracks.length)
 				return this.tracks[index];
-			spine.Utils.ensureArrayCapacity(this.tracks, index - this.tracks.length + 1, null);
+			spine.Utils.ensureArrayCapacity(this.tracks, index + 1, null);
 			this.tracks.length = index + 1;
 			return null;
 		};

spine-ts/build/spine-player.js

@@ -1755,7 +1755,7 @@ var spine;
 		AnimationState.prototype.expandToIndex = function (index) {
 			if (index < this.tracks.length)
 				return this.tracks[index];
-			spine.Utils.ensureArrayCapacity(this.tracks, index - this.tracks.length + 1, null);
+			spine.Utils.ensureArrayCapacity(this.tracks, index + 1, null);
 			this.tracks.length = index + 1;
 			return null;
 		};

spine-ts/build/spine-threejs.js

@@ -1755,7 +1755,7 @@ var spine;
 		AnimationState.prototype.expandToIndex = function (index) {
 			if (index < this.tracks.length)
 				return this.tracks[index];
-			spine.Utils.ensureArrayCapacity(this.tracks, index - this.tracks.length + 1, null);
+			spine.Utils.ensureArrayCapacity(this.tracks, index + 1, null);
 			this.tracks.length = index + 1;
 			return null;
 		};

spine-ts/build/spine-webgl.js

@@ -1755,7 +1755,7 @@ var spine;
 		AnimationState.prototype.expandToIndex = function (index) {
 			if (index < this.tracks.length)
 				return this.tracks[index];
-			spine.Utils.ensureArrayCapacity(this.tracks, index - this.tracks.length + 1, null);
+			spine.Utils.ensureArrayCapacity(this.tracks, index + 1, null);
 			this.tracks.length = index + 1;
 			return null;
 		};

spine-ts/core/src/AnimationState.ts

@@ -527,7 +527,7 @@ module spine {
 
 		expandToIndex (index: number) {
 			if (index < this.tracks.length) return this.tracks[index];
-			Utils.ensureArrayCapacity(this.tracks, index - this.tracks.length + 1, null);
+			Utils.ensureArrayCapacity(this.tracks, index + 1, null);
 			this.tracks.length = index + 1;
 			return null;
 		}