[Vala] foreach / Gee.Tree/HashMap

[Dennis Möhlmann <in dev nyda info>]

Hello,

I was running into an issue with Gee Maps and was wondering if this is
intended behaviour. Here's a minimal sample:

var map = new HashMap<int, string>();
map[1] = "first";
map[2] = "second";

foreach (var value in map) {
    stdout.printf((value ?? "null") + "\n");
}

stdout.printf("--\n");

foreach (var entry in map.entries) {
    stdout.printf((entry.value ?? "null") + "\n");
}

The resulting output is:

null
first
--
first
second

The first loop seems to start at the non-existing key 0. Adding map[0] =
"test" seems to confirm that:

test
first
second
--
test
first
second

"Gaps" in the map-keys produce similar issues. Looks like a bug to me,
but I thought I'd ask here first.

Regards,
  Dennis