Add 's'=sparse attribute for whos function (bug #60687) * syminfo.cc (symbol_info::display_line): Increase width of attribute string by one. Check m_is_sparse variable and display 's' if variable is sparse. * syminfo.cc (symbol_info_list::parse_whos_line_format): Increase column width for attribute field by one from 5 to 6. * syminfo.h (symbol_info): Initialize member variable "m_is_sparse" by calling octave_value method issparse(). Add method "is_sparse" which returns member variable "m_is_sparse". Define boolean member variable "m_is_sparse". * pt-eval.cc (Fwhos_line_format): Update documentation to discuss 's' = sparse attribute and for new value of whos_line_format. * pt-eval.h (tree_evaluator): Change initialization of member variable "m_whos_line_format" to make attribute field left-justified and of width 6. * NEWS: Add description of new attribute.

--- a/libinterp/parse-tree/pt-eval.h	Tue Jul 06 09:41:03 2021 -0700
+++ b/libinterp/parse-tree/pt-eval.h	Tue Jul 06 11:12:20 2021 -0700
@@ -133,7 +133,7 @@
         m_call_stack (*this), m_profiler (), m_debug_frame (0),
         m_debug_mode (false), m_quiet_breakpoint_flag (false),
         m_debugger_stack (), m_exit_status (0), m_max_recursion_depth (256),
-        m_whos_line_format ("  %a:4; %ln:6; %cs:16:6:1;  %rb:12;  %lc:-1;\n"),
+        m_whos_line_format ("  %la:5; %ln:6; %cs:16:6:1;  %rb:12;  %lc:-1;\n"),
         m_silent_functions (false), m_string_fill_char (' '), m_PS4 ("+ "),
         m_dbstep_flag (0), m_break_on_next_stmt (false), m_echo (ECHO_OFF),
         m_echo_state (false), m_echo_file_name (), m_echo_file_pos (1),