jscript: Fixed jsheap_grow implementation.

dlls/jscript/jsutils.c

@@ -126,13 +126,18 @@ void *jsheap_alloc(jsheap_t *heap, DWORD size)
 
 void *jsheap_grow(jsheap_t *heap, void *mem, DWORD size, DWORD inc)
 {
+    void *ret;
+
     if(mem == (BYTE*)heap->blocks[heap->last_block] + heap->offset-size
        && heap->offset+inc < block_size(heap->last_block)) {
         heap->offset += inc;
         return mem;
     }
 
-    return jsheap_alloc(heap, size+inc);
+    ret = jsheap_alloc(heap, size+inc);
+    if(ret) /* FIXME: avoid coppying for custom blocks */
+        memcpy(ret, mem, size);
+    return ret;
 }
 
 void jsheap_clear(jsheap_t *heap)

dlls/jscript/tests/regexp.js

@@ -44,6 +44,10 @@ ok(m[0] === "aa", "m[0] = " + m[0]);
 ok(RegExp.leftContext === " ", "RegExp.leftContext = " + RegExp.leftContext);
 ok(RegExp.rightContext === "baaa", "RegExp.rightContext = " + RegExp.rightContext);
 
+m = /^[^<]*(<(.|\s)+>)[^>]*$|^#(\w+)$/.exec(
+    "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx");
+ok(m === null, "m is not null");
+
 re = /a+/g;
 ok(re.lastIndex === 0, "re.lastIndex = " + re.lastIndex);