Fix hashtag column options styling (#14247)

* Enable nonces for stylesheets

* Pass nonce to react-select

config/initializers/content_security_policy.rb

@@ -47,7 +47,25 @@ end
 # https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy-Report-Only
 # Rails.application.config.content_security_policy_report_only = true
 
+Rails.application.config.content_security_policy_nonce_generator = -> request { SecureRandom.base64(16) }
+
+# Monkey-patching Rails 5
+module ActionDispatch
+  class ContentSecurityPolicy
+    def nonce_directive?(directive)
+      directive == 'style-src'
+    end
+  end
+end
+
+# Rails 6 would require the following instead:
+# Rails.application.config.content_security_policy_nonce_directives = %w(style-src)
+
 PgHero::HomeController.content_security_policy do |p|
   p.script_src :self, :unsafe_inline, assets_host
   p.style_src  :self, :unsafe_inline, assets_host
 end
+
+PgHero::HomeController.after_action do
+  request.content_security_policy_nonce_generator = nil
+end