fix the issue about measurement of content size in iOS7.1

[kazukiotsuka]

No description provided.

[manumenzella]

Hi @kazukiotsuka ! I am trying your fix but I'm still getting issues when running in a 64-bit environment. Particularly, when inputting several new lines until de textview has "overflowed" and then entering some text. The textview flickers. Can you recreate the issue?
It only happens when running in a 64-bit environment, and when building universal binaries.
Thank you!

[radhakrishnapai]

HI @kazukiotsuka. I find a similar issue when running in a 64 bit environment, as mentioned by @manumenzella. After flooding the textview when I press return or erase, the textView starts flickering. Please do look into this.