I've played a little bit with Launchpad backend. I must say it is pretty cool feature! However, every bug is added twice.
Steps to reproduce:
1, create launchpad backend, user name set to "izidor"
2, enable syncing
3, wait until syncing is over (the animation from backend dialog disappears)
4, every bug is there twice
I think it could be there because of some LibLarch bug, but it is not. Task tree looks like this:
<output of print_tree()>
root (None)
e81a06f1-cfc2-433d-a431-a48be09ccb65 (Bug 316922: Have a link to the parent(s) in the task editor)
59e779f0-2c66-4603-b3f5-1468b5380d3f (Bug 507158: [gtg-refactor] tags are not listed in tags treeview at first launch)
1260e1ec-ed65-42cc-b586-5976d372937b (Bug 559360: Wrong marked today in the calendar)
936efa28-577c-4074-b721-197f022a5c5d (Bug 589347: All Icons should be accessible when task is opened)
7fc291d4-6e89-4617-93c5-b2bc07fba77d (Bug 625708: New tag dialog should keep previous value)
17b0cc62-5c81-43dd-ab8d-514bd9ba5be2 (Bug 644993: Automatic generation of tag color)
b7574fe0-48a4-4c24-8b65-3926e5580754 (Bug 703245: Python2.7 treemodelsort crash)
ccd8ecd9-e9a1-4af0-a377-ab5ac2d22807 (Bug 806927: Creating a cycle dependency using Drag'n'Drop shouldn't be allowed)
<<It starts to be the same here>>
96dc2d73-167e-46a2-9cec-1f09816aea8d (Bug 316922: Have a link to the parent(s) in the task editor)
89ee0249-47e4-4bb0-aafe-1cefce78d626 (Bug 507158: [gtg-refactor] tags are not listed in tags treeview at first launch)
1e847767-cc74-4280-92dd-6fc78fa8d14b (Bug 559360: Wrong marked today in the calendar)
a9f57642-4c5b-41d4-a3b0-6ea967c80dee (Bug 589347: All Icons should be accessible when task is opened)
d913256e-4800-4927-9fdb-bbdae44ff460 (Bug 625708: New tag dialog should keep previous value)
9e96b1ae-5c44-4ce7-8a3d-9ff5fb833e89 (Bug 644993: Automatic generation of tag color)
c6301a43-d0df-4903-ae20-c9758fe3de79 (Bug 703245: Python2.7 treemodelsort crash)
ed74ee6b-81bd-4400-9b31-6442e643ce7e (Bug 806927: Creating a cycle dependency using Drag'n'Drop shouldn't be allowed)
</output>
Fixed in rev 976. Two different ids (link URL) were used...