check `supports_view_paths?` at registration time

If we check the conditional at registration time, then we can avoid the
conditional at runtime.  This commit checks for view path support when
the handler is registered so that runtime calls to `find_dependencies`
won't need to check the conditional.  The idea is that
`register_tracker` is called only once where `find_dependencies` may be
called many times.

1 files changed, 9 insertions, 7 deletions

diff --git a/actionview/lib/action_view/dependency_tracker.rb b/actionview/lib/action_view/dependency_tracker.rb
index 5a4c3ea3fe..fe98b370b7 100644
--- a/actionview/lib/action_view/dependency_tracker.rb
+++ b/actionview/lib/action_view/dependency_tracker.rb
@@ -7,18 +7,20 @@ module ActionView
 
     def self.find_dependencies(name, template, view_paths = nil)
       tracker = @trackers[template.handler]
-      return [] unless tracker.present?
+      return [] unless tracker
 
-      if tracker.respond_to?(:supports_view_paths?) && tracker.supports_view_paths?
-        tracker.call(name, template, view_paths)
-      else
-        tracker.call(name, template)
-      end
+      tracker.call(name, template, view_paths)
     end
 
     def self.register_tracker(extension, tracker)
       handler = Template.handler_for_extension(extension)
-      @trackers[handler] = tracker
+      if tracker.respond_to?(:supports_view_paths?)
+        @trackers[handler] = tracker
+      else
+        @trackers[handler] = lambda { |name, template, _|
+          tracker.call(name, template)
+        }
+      end
     end
 
     def self.remove_tracker(handler)