Update:

BTW, Alex, due to the different results from getLayoutParent() when the list
is empty or not, the idea of getUserData() fails as well. 

When the list is empty, which means getLayoutParent() returns the list, I
can retrieve the user data. But apparently I failed to do so when the list
is not empty.

Due to this problem (a bug?), it seems qx discourages reusing the same event
handler on different controls.
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