IDed as Chalia pulchra (GRAY, 1832). Family: Eurybrachyidae. ID credit: Jerome Constant.
The tree was Endorspermum malaccense.
Location: Selangor, Malaysia.
GIF animation of the egg laying process at different stages:
Please wait for the gif animation to load!
At one point, an assassin bug nymph came quite close to her, but retreated. Later, an ant came. You see only the ant here but not the assassin bug.
The assassin bug I mentioned previously.
I roughly counted and there were about 160 eggs.