fix orderedtable enlarge proc. (#5937)

This fixes issue #5917

lib/pure/collections/tables.nim

@@ -590,8 +590,11 @@ proc enlarge[A, B](t: var OrderedTable[A, B]) =
   swap(t.data, n)
   while h >= 0:
     var nxt = n[h].next
-    if isFilled(n[h].hcode):
-      var j = -1 - rawGetKnownHC(t, n[h].key, n[h].hcode)
+    let eh = n[h].hcode
+    if isFilled(eh):
+      var j: Hash = eh and maxHash(t)
+      while isFilled(t.data[j].hcode):
+        j = nextTry(j, maxHash(t))
       rawInsert(t, t.data, n[h].key, n[h].val, n[h].hcode, j)
     h = nxt
 

tests/stdlib/torderedtable.nim

@@ -0,0 +1,18 @@
+import tables, random
+var t = initOrderedTable[int,string]()
+
+# this tests issue #5917
+var data = newSeq[int]()
+for i in 0..<1000:
+  var x = random(1000)
+  if x notin t: data.add(x)
+  t[x] = "meh"
+
+# this checks that keys are re-inserted
+# in order when table is enlarged.
+var i = 0
+for k, v in t:
+  doAssert(k == data[i])
+  doAssert(v == "meh")
+  inc(i)
+