Hello,
I think this is a thick-billed warbler, seen a few days ago in Macau. It dwarfed the dusky warblers and common kingfishers hanging around here. No supercilium, a peak towards the rear of the head, very active and hanging out in the open. Took the pictures with the only camera I had, (sorry for the quality). These pictures are different than the ones posted in the warbler forum. Comments please.