Ensure user validations are run for new records

This works around an issue with rails failing to preserve attribute
change flags when we save a user record in the session.

rails/rails#49826
rails/rails#49827

app/models/user.rb

@@ -90,15 +90,15 @@ class User < ApplicationRecord
 
   validates :display_name, :presence => true, :length => 3..255,
                            :exclusion => %w[new terms save confirm confirm-email go_public reset-password forgot-password suspended]
-  validates :display_name, :if => proc { |u| u.display_name_changed? },
+  validates :display_name, :if => proc { |u| u.new_record? || u.display_name_changed? },
                            :uniqueness => { :case_sensitive => false }
-  validates :display_name, :if => proc { |u| u.display_name_changed? },
+  validates :display_name, :if => proc { |u| u.new_record? || u.display_name_changed? },
                            :characters => { :url_safe => true },
                            :whitespace => { :leading => false, :trailing => false }
   validates :email, :presence => true, :confirmation => true, :characters => true
-  validates :email, :if => proc { |u| u.email_changed? },
+  validates :email, :if => proc { |u| u.new_record? || u.email_changed? },
                     :uniqueness => { :case_sensitive => false }
-  validates :email, :if => proc { |u| u.email_changed? },
+  validates :email, :if => proc { |u| u.new_record? || u.email_changed? },
                     :whitespace => { :leading => false, :trailing => false }
   validates :pass_crypt, :confirmation => true, :length => 8..255
   validates :home_lat, :allow_nil => true, :numericality => true, :inclusion => { :in => -90..90 }
@@ -110,8 +110,8 @@ class User < ApplicationRecord
   validates :avatar, :if => proc { |u| u.attachment_changes["avatar"] },
                      :image => true
 
-  validates_email_format_of :email, :if => proc { |u| u.email_changed? }
-  validates_email_format_of :new_email, :allow_blank => true, :if => proc { |u| u.new_email_changed? }
+  validates_email_format_of :email, :if => proc { |u| u.new_record? || u.email_changed? }
+  validates_email_format_of :new_email, :allow_blank => true, :if => proc { |u| u.new_record? || u.new_email_changed? }
 
   alias_attribute :created_at, :creation_time