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*: avantgarde, beauty, bistro, buzzy, clean, cobalt, graphene, kea, yes This commit adapts the style attribute's add/remove operations in order to avoid ending up with the same property defined several times. task-4206845 Part-of: odoo/design-themes#933 Related: odoo/odoo#181194 Signed-off-by: Alice Gaudon (agau) <agau@odoo.com>