display activities

[Emmanuel Charruau]

Hi,
I have been commenting today on the following sentence

And maybe also, grey-out the filtered datasets to prevent them from
being selected, and display a notification that a Difficulty filter is
active (but that point is optional/to discuss).

in https://phabricator.kde.org/T12632

I totally agree with it. More than that it gave me a solution of a
long problem I have with GCompris.

Before the search feature was implemented, I often lost activities.
I forgot again and again that activities are displayed according to
the difficult level set in settings.

I would love if the activities out of difficulty range could still be
present, but unselectable and greyed.

Plus if we click on them, it would tell us that this activity can be
available if we chhange the level of difficulty. If we could have then
an additional button allowing the change of difficulty I would be even
happier !

What do you think about it? There could be easier ways!

Regards,

Emmanuel