Steps to Reproduce

http://zkfiddle.org/sample/3kivtbf/1-ZK-2313-in-safari

1. Use Safari to test
2. Click each button to test

Current Result

The result of "Model ROD True" is wrong and behaves oddly.

Expected Result

The result of "Model ROD True" is correct and behaves normally.

Debug Information

1. The height of listbox grows and shrinks since 8.5.2.1.
2. Only Safari has this issue.
3. B50-ZK-587.zul has a similar issue (if rows was used)

MeshWidget.js

hgh = $midVisiRow.offsetTop() + $midVisiRow.offsetHeight();

The value of $midVisiRow.offsetTop() is wrong in Safari (returns more like a scrollTop value)

Workaround