Resolve file paths in "backtrace"

Save mapping when doing "load" command
resolve filename in "backtrace" command

command/backtrace.sh

@@ -129,7 +129,8 @@ function _Dbg_do_backtrace {
     if (( frame_start == 0 )) ; then
 	((count--)) ;
 	adjusted_pos=$(_Dbg_frame_adjusted_pos 0)
-	filename=$(_Dbg_file_canonic "${BASH_SOURCE[$adjusted_pos]}")
+	filename=$(_Dbg_resolve_expand_filename "${BASH_SOURCE[$adjusted_pos]}")
+	filename=$(_Dbg_adjust_filename "$filename")
 	_Dbg_frame_print $(_Dbg_frame_prefix 0) '0' '' "$filename" "$_Dbg_frame_last_lineno" ''
     fi
 
@@ -168,7 +169,8 @@ function _Dbg_do_backtrace {
 	else
 	    lineno=${BASH_LINENO[$adjusted_pos-1]}
 	fi
-	filename=$(_Dbg_file_canonic "${BASH_SOURCE[$adjusted_pos]}")
+	filename=$(_Dbg_resolve_expand_filename "${BASH_SOURCE[$adjusted_pos]}")
+	filename=$(_Dbg_adjust_filename "$filename")
 	_Dbg_msg "($_Dbg_parm_str) called from file \`$filename'" "at line $lineno"
 	if (( show_source )) ; then
 	    _Dbg_get_source_line $lineno "${BASH_SOURCE[$adjusted_pos]}"

command/load.sh

@@ -2,7 +2,7 @@
 # Debugger load SCRIPT command.
 #
 #   Copyright (C) 2002-2006, 2008, 2010-2011, 2018-2019 Rocky
-#   Bernstein <rocky@gnu.org>
+#   2024 Bernstein <rocky@gnu.org>
 #
 #   This program is free software; you can redistribute it and/or
 #   modify it under the terms of the GNU General Public License as
@@ -54,6 +54,8 @@ _Dbg_do_load() {
 
     _Dbg_readin "$_Dbg_full_filename"
     _Dbg_msg "File $_Dbg_full_filename loaded."
+    _Dbg_file2canonic["${_Dbg_filename}"]="$_Dbg_full_filename"
+
   else
       _Dbg_errmsg "Couldn't resolve or read $_Dbg_filename"
       return 3