Show backtrace for some depreaction calls

lib/capybara/config.rb

@@ -86,7 +86,7 @@ module Capybara
     def deprecate(method, alternate_method, once = false)
       @deprecation_notified ||= {}
       unless once && @deprecation_notified[method]
-        warn "DEPRECATED: ##{method} is deprecated, please use ##{alternate_method} instead"
+        warn "DEPRECATED: ##{method} is deprecated, please use ##{alternate_method} instead: #{Capybara::Helpers.filter_backtrace(caller)}"
       end
       @deprecation_notified[method] = true
     end

lib/capybara/helpers.rb

@@ -70,6 +70,17 @@ module Capybara
       count == 1 ? singular : plural
     end
 
+    def filter_backtrace(trace)
+      return 'No backtrace' unless trace
+
+      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.dup if new_trace.empty?
+
+      new_trace.first.split(/:in /, 2).first
+    end
+
     if defined?(Process::CLOCK_MONOTONIC)
       def monotonic_time; Process.clock_gettime Process::CLOCK_MONOTONIC; end
     else

lib/capybara/node/matchers.rb

@@ -68,7 +68,7 @@ module Capybara
       # @deprecated Use {#matches_style?} instead.
       #
       def has_style?(styles, **options)
-        warn 'DEPRECATED: has_style? is deprecated, please use matches_style?'
+        warn "DEPRECATED: has_style? is deprecated, please use matches_style? : #{Capybara::Helpers.filter_backtrace(caller)}"
         matches_style?(styles, **options)
       end
 

lib/capybara/queries/text_query.rb

@@ -14,7 +14,7 @@ module Capybara
 
         if expected_text.nil? && !exact?
           warn 'Checking for expected text of nil is confusing and/or pointless since it will always match. '\
-               'Please specify a string or regexp instead.'
+               "Please specify a string or regexp instead. #{Capybara::Helpers.filter_backtrace(caller)}"
         end
 
         @expected_text = expected_text.is_a?(Regexp) ? expected_text : expected_text.to_s

lib/capybara/rspec/matchers.rb

@@ -154,7 +154,7 @@ module Capybara
     # @deprecated
     #
     def have_style(styles, **options)
-      warn 'DEPRECATED: have_style is deprecated, please use match_style'
+      warn "DEPRECATED: have_style is deprecated, please use match_style : #{Capybara::Helpers.filter_backtrace(caller)}"
       match_style(styles, **options)
     end
 

lib/capybara/selector/definition/css.rb

@@ -3,7 +3,7 @@
 Capybara.add_selector(:css, locator_type: [String, Symbol], raw_locator: true) do
   css do |css|
     if css.is_a? Symbol
-      warn "DEPRECATED: Passing a symbol (#{css.inspect}) as the CSS locator is deprecated - please pass a string instead."
+      warn "DEPRECATED: Passing a symbol (#{css.inspect}) as the CSS locator is deprecated - please pass a string instead : #{Capybara::Helpers.filter_backtrace(caller)}"
     end
     css
   end