ui.tools.error-list: better sorting and output

basis/debugger/debugger.factor

@@ -309,15 +309,14 @@ M: source-file-error error.
         [
             [
                 [ file>> [ % ": " % ] when* ]
-                [ line#>> [ # ": " % ] when* ]
-                [ summary % ] tri
+                [ line#>> [ # ": " % ] when* ] bi
             ] "" make
         ] [
             [
                 presented set
                 bold font-style set
             ] H{ } make-assoc
-        ] bi format nl
+        ] bi format
     ] [ error>> error. ] bi ;
 
 M: bad-effect summary

basis/ui/tools/error-list/error-list.factor

@@ -97,7 +97,8 @@ M: error-renderer column-titles
 M: error-renderer column-alignment drop { 0 1 0 0 } ;
 
 : sort-errors ( seq -- seq' )
-    [ [ [ file>> ] [ line#>> ] bi 2array ] compare ] sort ;
+    [ [ [ asset>> ] [ line#>> ] bi 2array ] keep ] { } map>assoc
+    sort-keys values ;
 
 : file-matches? ( error pathname/f -- ? )
     [ file>> ] [ dup [ string>> ] when ] bi* = ;