Fix text jump to top of page

Following replies in #1310 this fix is the best all in all fix for the jumping problem.

zoomcase firefox and chrome not jumping, internet explorer i didn't bother to test.
I intentionally scrolled left and down, to make it as general as possible and used high browser zoom.

![image](https://cloud.githubusercontent.com/assets/1194048/5180738/8b500fc6-748f-11e4-9b0c-2c77231d1189.png)

@slashgrin i opened parallel PR, sorry for not waiting your tests but i preferred to go on.