problem: When searching, the result list was not updated properly and clicking on a result was not registered if the user did not scroll through the list before (and therefore update)
this fix now makes debouncing searchupdates cleaner
also fixes a problem with the cancel button in the searchfield, which can apparently only handle iconbuttons

In order to be able to refresh single data lists (e.g. the groupmemberships after
a membership got added), this commit disentangles data from view and enables the
outside userTool to refresh single lists.