pulled in mark-moseley/ruby-debug-ide#4

Author: denofevil

lib/ruby-debug-ide.rb

@@ -109,7 +109,8 @@ def debug_program(options)
         @proceed.wait(@mutex)
       end
 
-      bt = debug_load(Debugger::PROG_SCRIPT, options.stop, options.load_mode)
+      abs_prog_script = File.absolute_path(Debugger::PROG_SCRIPT)
+      bt = debug_load(abs_prog_script, options.stop, options.load_mode)
       if bt && !bt.is_a?(SystemExit)
         $stderr.print bt.backtrace.map{|l| "\t#{l}"}.join("\n"), "\n"
         $stderr.print "Uncaught exception: #{bt}\n"