Fix actionManager dispose (BabylonJS#1149)

* Fix actionManager dispose

* Rectangle2D Primitives now render Border correctly in notRounded Case

Author: nockawa

src/Canvas2d/babylon.prim2dBase.ts

@@ -728,7 +728,7 @@
                 return false;
             }
 
-            if (!this._actionManager) {
+            if (this._actionManager) {
                 this._actionManager.dispose();
                 this._actionManager = null;
             }

src/Shaders/rect2d.vertex.fx

@@ -57,21 +57,50 @@ void main(void) {
 
 	// notRound case, only five vertices, 0 is center, then the 4 other for perimeter
 	if (properties.z == 0.0) {
+#ifdef Border
+		float w = properties.x;
+		float h = properties.y;
+		vec2 borderOffset = vec2(1.0, 1.0);
+
+		float segi = index;
+		if (index < 4.0) {
+			borderOffset = vec2(1.0 - (borderThickness*2.0 / w), 1.0 - (borderThickness*2.0 / h));
+		}
+		else {
+			segi -= 4.0;
+		}
+
+		if (segi == 0.0) {
+			pos2 = vec2(1.0, 1.0);
+		} 
+		else if (segi == 1.0) {
+			pos2 = vec2(1.0, 0.0);
+		}
+		else if (segi == 2.0) {
+			pos2 = vec2(0.0, 0.0);
+		} 
+		else {
+			pos2 = vec2(0.0, 1.0);
+		}
+		pos2.x = ((pos2.x - 0.5) * borderOffset.x) + 0.5;
+		pos2.y = ((pos2.y - 0.5) * borderOffset.y) + 0.5;
+#else
 		if (index == 0.0) {
 			pos2 = vec2(0.5, 0.5);
-		} 
+		}
 		else if (index == 1.0) {
 			pos2 = vec2(1.0, 1.0);
-		} 
+		}
 		else if (index == 2.0) {
 			pos2 = vec2(1.0, 0.0);
 		}
 		else if (index == 3.0) {
 			pos2 = vec2(0.0, 0.0);
-		} 
+		}
 		else {
 			pos2 = vec2(0.0, 1.0);
 		}
+#endif
 	}
 	else 
 	{