{9} Fix catalogue highlighting

Sometimes, when you select a resource in the catalogue all the resources shown are highlighted in violet (when not all the resources are related to this gadget).

I can not confirm what are the causes for this, but for now I only see this happening when selecting gadgets that have neither events or slots. Also this does not happen always.

On the other hand, given that the catalogue is multipaged, I think that this functionality should be provided in another way. For example, we can provide a button for searching all the compatible gadgets (by events, by slots or by events and slots) of a given gadget.

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