[RFC] vim-patch:7.4.357, 7.4.367, 7.4.376

**vim-patch:7.4.357**

Problem:    After completion some characters are not redrawn.
Solution:   Clear the command line unconditionally. (Jacob Niehus)

https://code.google.com/p/vim/source/detail?r=v7-4-357

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**vim-patch:7.4.367**

Problem:    Other solution for redrawing after completion.
Solution:   Schedule a window redraw instead of just clearing the command line. (Jacob Niehus)

https://code.google.com/p/vim/source/detail?r=v7-4-367

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**vim-patch:7.4.376**

Problem:    Popup menu flickers too much.
Solution:   Remove the forced redraw. (Hirohito Higashi)

https://code.google.com/p/vim/source/detail?r=v7-4-376

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These three patches combined change nothing in the code apart from adding a TODO. I have combined them into one commit with the description of 7.4.376. Please tell me if the commit message should be different in this case.