bug#20847: [display engine] 25.0.50; company-mode popup makes point jump to an entirely different location

[Dmitry Gutov]

On 06/21/2015 10:23 PM, Eli Zaretskii wrote:

> The reason is that there's an invisible property on buffer text.  When
> redisplay fails to place the cursor where it belongs, i.e. on the line
> that ends with "hel", it looks for alternative strategies.

I guess the next question would be why redisplay fails to place the 
cursor after 9, but not after 6. The value of point, and the buffer 
contents, are the same in both situations, aren't they?

> I can make the code bypass this in the case in point, but the result
> will be that cursor will be displayed at the end of the first screen
> line, which is hardly better.

If cursor was displayed wherever but point didn't move, that would be 
better. But you probably mean to move point as well.

> So I think we should try telling the display engine where to put the
> cursor via the 'cursor' property on buffer text, as proposed earlier.

Okay, thanks.