always update omnicomplete scratch preview
when using omnicomplete I get a nice scratch preview window when I type
But what I would like is to get that preview window updated always, i.e.
not only when hitting CTRL-X CTRL-O
For instance, if I type in insert mode (without using CTRL-X CTRL-O):
I would like the preview window to get updated with the information of
my_function as soon as I finish typing the word my_function.
And I would also like it to get update when leaving the cursor on a
word. Something similar to the PreviewWord function, see :helpgrep
PreviewWord, but with a omnicomplete style preview, i.e. a preview
window that looks like:
cmd void my_function()