Vim maximise weirdness

Hi all,

This is probably one of the most minor problems I've ever had with
vim, but I thought I'd report it in case anyone understands what's
going on here.

I've just (finally) decided to upgrade to Vim 8. I initially
installed the Windows executable version from
https://vim.sourceforge.io/download.php#pc but found it didn't support
python, so have compiled my own version.

When I start gvim, I often want to immediately maximise the window and
have tended to do this with a simple mapping ("map ,x :simalt ~x<CR>")
- start gvim and hit ,x - this is pretty instinctive now! I know
there are probably other alternatives, but I like the default being
non-maximised and a quick key combination changing to maximised.

With the newly compiled version of vim (details below), `:simalt ~x`
doesn't do quite what I was expecting: the window gets bigger but the
drawn area doesn't - https://snag.gy/3VfqUe.jpg

Pressing Ctrl-L sorts it out, it's just slightly odd that it's not
redrawing to fill the screen. Clicking on the maximise icon in the
top right hand corner of the window works correctly - it's just simalt
~x that doesn't. Note that this was all tested with -u NONE -U NONE.
With the current executable from the website (8.0.69), the behaviour
is correct.

I know this is a really minor gripe; I just thought it was worth mentioning.

The compiler configuration I use is made up of two scripts,
configure_vim.cmd (http://pastebin.com/QwKtCHvy) and build_vim.cmd
(http://pastebin.com/apxqsz6f). The :version information is here:
http://pastebin.com/raw/Gfusk1Fw

Al

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