Merge branch 'master' into glitch-soc/merge-upstream

Conflicts:
- app/views/admin/pending_accounts/index.html.haml
  No real conflict, upstream changes too close to glitch-specific
  theming system changes.
- config/navigation.rb
  Upstream redesigned the settings navigation, took those changes
  and re-inserted the flavours menu.

app/validators/html_validator.rb

@@ -1,18 +1,20 @@
 # frozen_string_literal: true
 
 class HtmlValidator < ActiveModel::EachValidator
+  ERROR_RE = /Opening and ending tag mismatch|Unexpected end tag/
+
   def validate_each(record, attribute, value)
     return if value.blank?
+
     errors = html_errors(value)
-    unless errors.empty?
-      record.errors.add(attribute, I18n.t('html_validator.invalid_markup', error: errors.first.to_s))
-    end
+
+    record.errors.add(attribute, I18n.t('html_validator.invalid_markup', error: errors.first.to_s)) unless errors.empty?
   end
 
   private
 
   def html_errors(str)
-    fragment = Nokogiri::HTML.fragment(str)
-    fragment.errors
+    fragment = Nokogiri::HTML.fragment(options[:wrap_with] ? "<#{options[:wrap_with]}>#{str}</#{options[:wrap_with]}>" : str)
+    fragment.errors.select { |error| ERROR_RE =~ error.message }
   end
 end

app/validators/poll_validator.rb

@@ -14,6 +14,6 @@ class PollValidator < ActiveModel::Validator
     poll.errors.add(:options, I18n.t('polls.errors.over_character_limit', max: MAX_OPTION_CHARS)) if poll.options.any? { |option| option.mb_chars.grapheme_length > MAX_OPTION_CHARS }
     poll.errors.add(:options, I18n.t('polls.errors.duplicate_options')) unless poll.options.uniq.size == poll.options.size
     poll.errors.add(:expires_at, I18n.t('polls.errors.duration_too_long')) if poll.expires_at.nil? || poll.expires_at - current_time > MAX_EXPIRATION
-    poll.errors.add(:expires_at, I18n.t('polls.errors.duration_too_short')) if poll.expires_at.present? && poll.expires_at - current_time < MIN_EXPIRATION
+    poll.errors.add(:expires_at, I18n.t('polls.errors.duration_too_short')) if poll.expires_at.present? && (poll.expires_at - current_time).ceil < MIN_EXPIRATION
   end
 end