Function checkShareManagePermission

Determine whether user may Update/Delete a share row they don't own via role permissions. Returns true when the user is the grantor, or when the optional additional(userId) predicate says they have some domain-specific management right (e.g., dashboard owner, Owner-level grantee).

Use:

override CheckPermissions(type, throwError) {
    if ((type === Update || Delete) && this.ActiveUser &&
        checkShareManagePermission(this.ActiveUser, this.SharedByUserID, (u) => …)) {
        return true;
    }
    return super.CheckPermissions(type, throwError);
}
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