[T3] fix bug with split lines functionality

T3/lines.js

@@ -130,6 +130,7 @@ function handleMouse() {
         break;
       }
     } else if (rightClick) {
+      if ((mouseY >= lines[i].y0 && mouseY <= lines[i].yf) || (mouseY >= lines[i].yf && mouseY <= lines[i].y0)) {
         if (mouseX >= lines[i].x0 && mouseX <= lines[i].xf) {
           lines[lines.length] = new Line(mouseX,mouseY,lines[i].xf,lines[i].yf);
           lines[i].xf = mouseX;
@@ -154,6 +155,7 @@ function handleMouse() {
       }
     }
   } 
+}
 
 function generatePolygon() {
   edges = parseInt(document.getElementById("number").value,10);