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

[Dmitry Gutov <dgutov@yandex.ru>]

On 06/22/2015 07:26 PM, Eli Zaretskii wrote:

>> This doesn't seem to have any effect, though. Adding
>>
>>         (when (eq ?\n (char-after (overlay-start ov)))
>>           (let ((inhibit-modification-hooks t))
>>             (put-text-property (overlay-start ov) (1+ (overlay-start ov))
>> 'cursor t)))
>>
>> to the end of company-pseudo-tooltip-unhide creates no change in the
>> behavior.
>
> That's because I have yet to write the code to support that ;-)

I'm not sure I like that idea. If I have to write a workaround (this 
definitely feels like it), I'd rather write a workaround that will work 
in the current Emacs releases too. (If I manage to, of course).

And supporting `cursor' on buffer text newline but not on overlay 
display string newline feels like adding a yet-another edge case.

> Will do next; meanwhile, could you perhaps send the above as diffs
> relatively to whatever version of company.el you want me to test this
> with?  TIA.

Maybe after I exhaust the other approaches.

Going back to your earlier message, I'm actually not sure I agree with this:

 > Any scenario where a screen line ends in a newline that comes from an
 > overlay string [performs better under the current behavior].  Try
 > several such scenarios, and then tell me whether
 > the place we display the cursor looks better than the alternative.

The current example shows that it's better to display the cursor on the 
margin, rather than after the overlay. What are the examples where this 
is not true? Are those cases where the said newline is not at the 
beginning of the overlay?

Even if cursor would look weird in some case, at least point is not 
forcibly moved to a different position.