Fix list height not readjusting if elements are removed. #194
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Say we have a long list like this, and we want to shorten it with a "Hide" button which will pass only half of the data to the list:

After clicking hide, our elements disappeared, however list size hasn't re-adjusted, leaving us with lots of whitespace:

It seems that
onLayout
for rows is called only once, so after initial load we don't recalculate list height in_onUpdateLayouts
on line 356. This PR seems to fix this.