autocompletion blocks CTRL-U in insert mode

[chtenb]

When typing in insert mode, it's not possible to clear the current line with CTRL-U.
This seems to coincide with some auto-completion related message in the statusline, like "User defined completion (^U^N^P) Pattern not found".
After pressing escape and re-entering insert mode this disappears.
Just waiting a few seconds makes the message disappear as well.
When the message has disappeared, CTRL-U works just fine.

BTW, CTRL-W (to delete a word backwards in insert mode), which is a similar command, doesn't experience problems.

[Valloric]

Closing as duplicate of #24

[Shougo]

It is Vim's feature. Vim disable Ctrl-u mappings in completefunc completion mode.

[mikebobroski]

It may be worth noting that you can use <C-]><C-U>. <C-]> gets you out of completion mode. It's an additional key press, but better than nothing.