Minor code cleanup

lib/capybara/helpers.rb

@@ -75,7 +75,7 @@ module Capybara
 
       filter = %r{lib/capybara/|lib/rspec/|lib/minitest/}
       new_trace = trace.take_while { |line| line !~ filter }
-      new_trace = trace.reject { |line| line =~ filter } if new_trace.empty?
+      new_trace = trace.grep_v(filter) if new_trace.empty?
       new_trace = trace.dup if new_trace.empty?
 
       new_trace.first.split(/:in /, 2).first

lib/capybara/rack_test/node.rb

@@ -216,7 +216,7 @@ private
     min, max, step = (native['min'] || 0).to_f, (native['max'] || 100).to_f, (native['step'] || 1).to_f
     value = value.to_f
     value = value.clamp(min, max)
-    value = ((value - min) / step).round * step + min
+    value = (((value - min) / step).round * step) + min
     native['value'] = value.clamp(min, max)
   end
 

lib/capybara/selector/css.rb

@@ -43,7 +43,7 @@ module Capybara
               when '"', "'"
                 selector << parse_string(char, str)
               when '\\'
-                selector << char + str.getc
+                selector << (char + str.getc)
               when ','
                 selectors << selector.strip
                 selector.clear

lib/capybara/selenium/nodes/chrome_node.rb

@@ -63,6 +63,7 @@ class Capybara::Selenium::ChromeNode < Capybara::Selenium::Node
 
   def visible?
     return super unless native_displayed?
+
     begin
       bridge.send(:execute, :is_element_displayed, id: native_id)
     rescue Selenium::WebDriver::Error::UnknownCommandError