Opciones para clasificar registros en la vista Tree por color del texto
decoration-info: Azul

decoration-success: Verde

decoration-warning: Naranja

decoration-danger: Rojo

decoration-bf: Negrita

decoration-muted: Gris, que simula un estilo deshabilitado.

Ejemplo de uso:

<record id="book_tree_view" model="ir.ui.view">

   <field name="name">tutorial.book.tree</field>

   <field name="model">tutorial.book</field>

   <field name="arch" type="xml">

       <tree string="Tutorial Book"  

decoration-muted="state=='borrowed'" decoration-info="state=='available'">

           <field name="name"/>

           <field name="publish_date"/>

           <field name="author"/>

           <field name="pages_count"/>

           <field name="is_classic"/>

           <field name="state"/>

       </tree>

   </field>

</record>