Description of problem:
CSS overflow detection algorithm performs badly, are really slow

Version-Release number of selected component (if applicable):
4.0, 3.6

How reproducible:
always

Steps to Reproduce:
using a JavaScript profiler and a draft-compiled engine, you can see that a lot of time is spent in org.ovirt.engine.ui.common.utils.ElementUtils::detectOverflowUsingScrollWidth and detectOverflowUsingClientHeight

Actual results:
bad performance

Expected results:
better performance

Additional info:
These algorithms are used to detect when to truncate text in grid cells. They are used heavily, so they need to perform better.