Yasuhiro Matsumoto wrote:

> On Saturday, July 9, 2016 at 5:20:16 AM UTC+9, Bram Moolenaar wrote:
> > I wrote:
> > 
> > > Patch 7.4.2003
> > > Problem:    Still cursor flickering when a callback updates the screen. 
> > > (David
> > >             Samvelyan)
> > > Solution:   Put the cursor in the right position after updating the 
> > > screen.
> > > Files:      src/screen.c
> > 
> > Looks like this fix triggers another cursor positioning problem.
> > When doing "rx" it first gets displayed in the right place, then drawn
> > two characters to the left.  Not sure where that comes from yet...
> 
> As your worries, this change doesn't work with multi-byte characters 
> correctly. When the cursor goes down bottom of screen, and the cursor 
> overwrap with trailing-byte of multi-byte, screen break drawing.
> 
> [][][]_ []
> --------------- bottom line
> X[][][][]
> 
> "_" is cursor.
> 
> https://cloud.githubusercontent.com/assets/518808/19011184/a29ebeee-87c9-11e6-9d5e-032e9423b7ae.png
> 
> gui.col should be fixed if the cursor is overwrapped on the
> trailing-byte of multibyte.

Thanks.  I suppose it's not so easy to write a test for this.

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