Bug#42735: dbug treated duplicate keywords (-#d,kw,kw) incorrectly

dbug/dbug.c

@@ -1451,7 +1451,9 @@ next:
     {
       if (!strncmp((*cur)->str, start, len))
       {
-        if (todo == EXCLUDE)
+        if ((*cur)->flags & todo)  /* same action ? */
+          (*cur)->flags|= subdir;  /* just merge the SUBDIR flag */
+        else if (todo == EXCLUDE)
         {
           struct link *delme=*cur;
           *cur=(*cur)->next_link;

dbug/tests-t.pl

@@ -483,3 +483,14 @@ func2: info: s=ko
 | | <func3
 | <func2
 <main
+# repeated keyword
+% ./tests d:-d,info,info
+=> execute
+=> evaluate: ON
+=> evaluate_if: OFF
+main: explain: dbug explained: d:-d,info
+% ./tests d:-d,info/,info
+=> execute
+=> evaluate: ON
+=> evaluate_if: OFF
+main: explain: dbug explained: d:-d,info/