Fix for height jitters when truncating single lines

[caesay]

This fixed 99% of the annoyances I was having with heights jittering while watching recent event feeds. It works by briefly setting the overflow and white-space css properties in the initial render so the text will not wrap and effect the height. After the first truncate these properties are reset.

Note that it is actually a requirement that we reset the properties before we truncate, because trunk8 internally only looks at the height of an element to determine whether to truncate it or not.

Also note that truncating immediately on the initial render does not work because (presumably) the initial render of the DOM has not finished yet and trunk8 can not determine where to trim it.

Closes #130

[CLAassistant]

All committers have signed the CLA.

[niemyjski]

Thanks for the PR! I was able to reproduce it by submitting an event with a really really long identity.