avoid printing debug location in cmd window when using GUI to step * pt-eval.cc, pt-eval.h (tree_evaluator::quiet_breakpoint_flag): New member variable. * debug.cc (Fdb_next_breakpoint_quiet): New function. * main-window.cc (main_window::execute_debug_callback): Call Fdb_next_breakpoint_quiet prior to Fdbstep and Fdbcont. * input.cc, input.h (get_debug_input): Don't print debug location if tree_evaluator::quiet_breakpoint_flag is true. Reset it after checking. * lex.ll (octave_lexer::fill_flex_buffer, octave_push_lexer::fill_flex_buffer): Don't abort if input_buf is empty.

--- a/libinterp/parse-tree/pt-eval.cc	Thu Dec 04 15:56:49 2014 -0500
+++ b/libinterp/parse-tree/pt-eval.cc	Thu Dec 04 16:06:31 2014 -0500
@@ -57,6 +57,8 @@
 
 bool tree_evaluator::debug_mode = false;
 
+bool tree_evaluator::quiet_breakpoint_flag = false;
+
 tree_evaluator::stmt_list_type tree_evaluator::statement_context
   = tree_evaluator::other;