If the current user is in one group or several, I would have a filter who lists all the tasks of the group(s) of the current user ? I would like to use this filter in a shared dashboard with a filter result gadget for all the users. Can I do that ?
For most JIRA installations, the answer to that is actually "show me all the issues". The reason is that your users are all in a group called "JIRA users" which is the "can log in" group.
For that reason, JIRA doesn't have any functions that look at the current groups of a user because it's pretty much useless, you get everything, every time.
You'll need to find (in the marketplace) or write a JQL function that can extract "Groups of the current user, excluding arbitrary groups in the result"
Not with a standard JQL.
But you can create custom JQL function. Please take a look here:
JQL to find all issues where the user's group is in a group customfield?
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