When completefunction returns -2, still in Ctrl-X mode

[matsushita shougo]

This issue is related to
7.3.418(https://groups.google.com/forum/#!topic/vim_dev/_w4mI5MQITs/discussion)
changes.

If completefunc returns -2, Vim is still in Ctrl-X mode.
This behavior some affectons(ex: conflicts IM behavior and flicks "^X
mode" in command line).
So, I added below patch.

This patch is :
If completefunc returns -2, cancel completefunc silently(but still in
Ctrl-X mode).
If completefunc returns -3, exit Ctrl-X mode silently.

[mattn]

Bram, I reviewed this patch in few weeks ago, and confirmed this patch is working well.

[Bram Moolenaar]

Thanks, I will add this to the todo list.

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