Bugfix: A lone quote inside quotes should not be escaped for FSS Basi…

…c and Extended.

The command and results:
  # fss_extended_write -oc "'" '"' -oc '"' "'" -oc ' `' "\` " -oc "'" "'" | fss_extended_read -oc
  ' \"
  \" '
  ` `
  ' '

Is incorrect.
The correct results should be:
  # fss_extended_write -oc "'" '"' -oc '"' "'" -oc ' `' "\` " -oc "'" "'" | fss_extended_read -oc
  ' "
  " '
  ` `
  ' '

The problem is that in the case where the quote is already within a quoted string then it should not be escaped.
This only applies for the quote that would not be a valid closing quote.

level_1/fl_fss/c/private-fss.c

@@ -972,19 +972,25 @@ extern "C" {
       else if (object.string[range->start] == quote_char) {
         item_first = range->start++;
 
-        // The very first quote, must be escaped, when quoting is disabled.
+        status = f_fss_skip_past_delimit(state, object, range);
+        if (F_status_is_error(status)) return status;
+
+        // The very first quote, must be escaped, but only when quoting is disabled or first quote is followed by white space.
         if (item_first == input_start) {
-          status = f_string_dynamic_increase(state.step_large, destination);
-          if (F_status_is_error(status)) break;
+          if (quote_is) {
+            status = f_fss_is_space(state, object, *range);
+            if (F_status_is_error(status)) break;
+          }
 
-          destination->string[used_start + 1] = f_fss_delimit_slash_s.string[0];
-        }
+          if (!quote_is || quote_is && status == F_true) {
+            status = f_string_dynamic_increase(state.step_large, destination);
+            if (F_status_is_error(status)) break;
 
-        status = f_fss_skip_past_delimit(state, object, range);
-        if (F_status_is_error(status)) return status;
+            destination->string[used_start + 1] = f_fss_delimit_slash_s.string[0];
+          }
+        }
 
         if (range->start > range->stop || range->start >= object.used) {
-
           status = f_string_dynamic_increase(state.step_large, destination);
           if (F_status_is_error(status)) break;