Fix right&bottom edge of point-in-rect test

x==0 and width==100 means the rectangle spans from 0 to 99. 100 is not
part of the rectangle anymore.

online-editor.js

@@ -320,8 +320,8 @@ function besRenderPopup(matches, popup, clientX, clientY) {
 function besIsPointInRect(x, y, rect) {
   return (
     x >= rect.x &&
-    x <= rect.x + rect.width &&
+    x < rect.x + rect.width &&
     y >= rect.y &&
-    y <= rect.y + rect.height
+    y < rect.y + rect.height
   )
 }