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Fix Sugarizer issue #398 and send a PR on the dev branch.

Description of the issue:

When an user want to share an activity, he click on the presence palette, then on the neighborhood icon.

In some activity, when the icon is clicked, the palette automatically close. For example in Maze activity. On some other, the palette remain open which is not pertinent.

The idea is to generalize this feature by calling popDown method like here.

So the following activities should be fixed:

• [ ] Chat activity
• [ ] Memorize activity
• [ ] Paint activity