Add $group object to bp_get_group_join_button filter.

[dcavins]

The only parameter passed along with the bp_get_group_join_button is the button object. It looks like this:

Array
(
    [id] => accept_invite
    [component] => groups
    [must_be_logged_in] => 1
    [block_self] => 
    [wrapper_class] =>  private
    [wrapper_id] => groupbutton-5
    [link_href] => http://commonsdev.local/groups/istanbul-secrets/request-membership
    [link_text] => Accept Invitation
    [link_title] => Accept Invitation
    [link_class] => group-button accept-invite
)

Passing the group object along with the button in the filter would make it much easier to generate new properties for the button.

[DJPaul]

Sure. Go ahead!

[dcavins]

In 9969:

Add $group to bp_get_group_join_button filter.

Add the current BuddyPress group object to the
bp_get_group_join_button filter arguments.

Fixes #6526.