Use :rerun_file_path when checking location filters

Fixes #1961

The problem with using :absolute_file_path is that it doesn't function
correctly for shared examples in an external file. The filter manager thinks
that there are no location filters set, when actually there are. Since
MetadataFilter already handles location filtering correctly across multiple
nested examples / files, correcting the path that is checked is sufficient to
fix the line filtering issue.

lib/rspec/core/filter_manager.rb

@@ -99,8 +99,10 @@ def prune_conditionally_filtered_examples(examples)
       # defined in the same file as the location filters. Excluded specs in
       # other files should still be excluded.
       def file_scoped_include?(ex_metadata, ids, locations)
-        no_location_filters = locations[ex_metadata[:absolute_file_path]].empty?
         no_id_filters = ids[ex_metadata[:rerun_file_path]].empty?
+        no_location_filters = locations[
+          File.expand_path(ex_metadata[:rerun_file_path])
+        ].empty?
 
         return yield if no_location_filters && no_id_filters
 

spec/rspec/core/filter_manager_spec.rb

@@ -159,6 +159,28 @@ def example_with(*args)
             included_via_tag, excluded_via_tag
           ]).map(&:description)).to eq([included_via_loc_or_id, included_via_tag].map(&:description))
         end
+
+        it "skips examples in external files when included from a #{type} filtered file" do
+          group = RSpec.describe("group")
+
+          included_via_loc_or_id = group.example("inc via #{type}"); line = __LINE__
+
+          # instantiate shared example in external file
+          instance_eval <<-EOS, "a_shared_example.rb", 1
+            RSpec.shared_examples_for("a shared example") do
+              example("inside of a shared example")
+            end
+          EOS
+
+          included_via_behaves_like = group.it_behaves_like("a shared example")
+          test_inside_a_shared_example = included_via_behaves_like.examples.first
+
+          add_filter(:line_number => line, :scoped_id => "1:1")
+
+          expect(prune([
+            included_via_loc_or_id, test_inside_a_shared_example
+          ]).map(&:description)).to eq([included_via_loc_or_id].map(&:description))
+        end
       end
 
       describe "location filtering" do