[rubygems/rubygems] Fix bundle update --redownload

It now does the redownloading/installing just like bundle install --redownload

https://github.com/rubygems/rubygems/commit/3b058e5eca

lib/bundler/cli/update.rb

@@ -63,6 +63,7 @@ module Bundler
       opts = options.dup
       opts["update"] = true
       opts["local"] = options[:local]
+      opts["force"] = options[:redownload]
 
       Bundler.settings.set_command_option_if_given :jobs, opts["jobs"]
 

spec/bundler/update/redownload_spec.rb

@@ -30,5 +30,15 @@ RSpec.describe "bundle update" do
       bundle "update rack --no-color --redownload"
       expect(err).not_to include "[DEPRECATED] The `--force` option has been renamed to `--redownload`"
     end
+
+    it "re-installs installed gems" do
+      rack_lib = default_bundle_path("gems/rack-1.0.0/lib/rack.rb")
+      rack_lib.open("w") {|f| f.write("blah blah blah") }
+      bundle :update, :redownload => true
+
+      expect(out).to include "Installing rack 1.0.0"
+      expect(rack_lib.open(&:read)).to eq("RACK = '1.0.0'\n")
+      expect(the_bundle).to include_gems "rack 1.0.0"
+    end
   end
 end