header_nav migration 1.4 to 1.6.17

[Mavenace]

I just migrated Prestashop 1.4.6.2 to Prestashop 1.6.1.7, despite some issues, especially with picture and birthday required, which I solved I have one issue remaining.

 

The developer, unfortunately, has updated the default PrestaShop template which I finally could solve but it might mean that he/she has changed more "core" files that I do not know and you guessed it, this developer did not leave any documentation.

 

The issue:

 

On 1.4 when someone adds something to the shopping_cart, the trolley turns green by using the global.css file.

Both the 1.4 and 1.6.1.7 have the following #header_nav.green in the global.css

 

#header_nav.green {

 

1. background-image:url('../img/cart_green.png');

 

In 1.6.1.7 however, the global.css file is the same but in the source on 1.4 you can read:

 

<!-- Block user information module HEADER -->   <div id="header_user">   <ul id="header_nav" class="green">   <li id="shopping_cart">

 

where on 1.6.1.7

<!-- Block user information module HEADER -->   <div id="header_user" >   <ul id="header_nav">  

<li id="shopping_cart">

 

Where in the system is PrestaShop telling the shopping cart that something has been added for the trolley to turn GREEN.

 

Appreciate your help