bug#34614: 26.1.92; When reading input in mini-buffer, message to each area overide the input prompt

[Zhang Haijun]

> 在 2019年2月23日，下午4:01，Eli Zaretskii <eliz@gnu.org> 写道：
> 
>> From: Zhang Haijun <ccsmile2008@outlook.com>
>> Date: Sat, 23 Feb 2019 02:33:23 +0000
>> Cc: "34614@debbugs.gnu.org" <34614@debbugs.gnu.org>
>> 
>> On timeout of minibuffer-message-timeout, can emacs trigger a redisplay?
> 
> Are you sure a missing redisplay is the problem here?  In general,
> Emacs should know by itself there's a need for redisplay.

I’m not sure. But the input UI comes back after either of the following 
operations:
1. resize the frame
2. resize a window with mouse dragging in the frame
3. Mouse click on anywhere in the frame

It seems that it just needs a redisplay.