vim buffer does not refresh correctly when navigation is entered before it loads

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Really a minor thing, but because vim takes so long to load in NaCl Dev 
Environment, it's easy to make happen.

1) vim really_big_file
2) before vim is loaded, type 1G or G (depending on where you left off in the 
file)
3) note that when the file loads, you are at the last location you edited, not 
at the beginning or end of the file as you would expect.   However, if you 
issue another navigation event (like pressing h,j,k,l) you will jump to the 
location you typed before load.  So it looks like a display refresh issue more 
than a real navigation problem.

There may be an underlying issue with refreshing the buffer properly as I've 
seen inter-mixed lines sporadically in vim too (using page-up/down on a large 
file seems to trigger bad display for instance)

Original issue reported on code.google.com by elijahta...@chromium.org on 17 Oct 2014 at 5:05