You can clone with
HTTPS or Subversion.
and you can see, that we have small scrolling to top and in some scales(110% for example) have strange behavior with cursor position
win7 x64, chrome 17.0.963.83. m
chrome started to use fractional line heights depending on zoom level
el.style.height = '15px'
el.getBoundingClientRect().height // 14.7888..
probably this is a bug in chrome, but
using getBoundingClientRect in text layer's $measureSizes fixes it
fixed in b0bbb36 (cc #870)