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bug#20847: [display engine] 25.0.50; company-mode popup makes point jump

From: Dmitry Gutov
Subject: bug#20847: [display engine] 25.0.50; company-mode popup makes point jump to an entirely different location
Date: Tue, 23 Jun 2015 03:15:51 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.0

On 06/22/2015 07:23 PM, Eli Zaretskii wrote:

I see.  Is this something you need to determine in addition to knowing
whether point is at the last position of a screen line?

I think so. It's only when point is at the last position, and when the line continues afterwards, and there's no truncation, or word-wrap, that I could omit the newline at the beginning of the completion overlay display string. And I've probably missed some possibility.

That's a lot of things to check.

The example I have is the exact recipe with which you started this bug
report.  As soon as you type "el" in step 6, and the "tooltip" with
completions pops up, look at the next paragraph of text below the
"tooltip" -- you will see the rightmost character on every line of
that paragraph disappear.  (For this to show, you need to have both
fringes, but "emacs -Q" should make sure you do.)

Thank you. I've never noticed it myself before. It was an implementation quirk, now fixed in master.

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