Clear memoized method/attribute caches on re-parse

After clearing methods and attributes from a file in
clear_file_contributions, the memoized lists (@instance_methods,
@class_method_list, @instance_attributes, @class_attributes) still
held stale data, causing the sidebar navigation to show outdated
entries when methods were added or removed.

Author: st0012

lib/rdoc/store.rb

@@ -234,6 +234,12 @@ def clear_file_contributions(relative_name, keep_position: false)
       cm.method_list.each { |m| cm.methods_hash[m.pretty_name] = m }
       cm.attributes.each { |a| cm.methods_hash[a.pretty_name] = a }
 
+      # Clear memoized method/attribute lists so they rebuild from current data
+      cm.instance_variable_set(:@instance_methods, nil)
+      cm.instance_variable_set(:@class_method_list, nil)
+      cm.instance_variable_set(:@instance_attributes, nil)
+      cm.instance_variable_set(:@class_attributes, nil)
+
       # Remove constants contributed by this file
       cm.constants.reject! { |c| c.file == top_level }
       cm.constants_hash.clear