Fix heapsort in capture list construction (#748)

src/pcre2_compile_cgroup.c

@@ -479,6 +479,7 @@ while (TRUE)
   tmp = captures[i];
   captures[i] = captures[max];
   captures[max] = tmp;
+  i = max;
   }
 }
 

testdata/testinput2

@@ -7961,6 +7961,9 @@ a)"xI
 \= Expect no match
   Saturday,Sun
 
+/()()()(?2(2,3,2,3,2))/B
+  abc
+
 # Test each syntax used for recursion
 
 /(?(R)(Sat)urday|(?R(1)),\1)/

testdata/testoutput2

@@ -22408,6 +22408,27 @@ No match
   Saturday,Sun
 No match
 
+/()()()(?2(2,3,2,3,2))/B
+------------------------------------------------------------------
+        Bra
+        CBra 1
+        Ket
+        CBra 2
+        Ket
+        CBra 3
+        Ket
+        Recurse
+      2 Capture ref
+      3 Capture ref
+        Ket
+        End
+------------------------------------------------------------------
+  abc
+ 0: 
+ 1: 
+ 2: 
+ 3: 
+
 # Test each syntax used for recursion
 
 /(?(R)(Sat)urday|(?R(1)),\1)/