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bug#27427: 26.0.50; Native line numbers lead to display error in company

From: Dmitry Gutov
Subject: bug#27427: 26.0.50; Native line numbers lead to display error in company-mode popup
Date: Sun, 25 Jun 2017 17:46:23 +0300
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:54.0) Gecko/20100101 Thunderbird/54.0

On 6/25/17 5:13 PM, Eli Zaretskii wrote:

The displayed line number reflects the line of the buffer positions
corresponding to what's on that screen line.  If none of the buffer
positions appear on that screen line, it's the line of the buffer
position(s) "covered" by the display string/overlay which generates
the display.

It didn't look like this in the previous version. Might be considered a bit annoying, repeating the number several times.

BTW, by that logic, the last empty line should have a number as well: it does correspond to a buffer position.

If what you see doesn't fit this description, please show a
screenshot, and describe or show the code which puts the overlay that
causes the display.

It does fit the description.

I'm not sure I understand: are you saying that you've put the property
in that case and it didn't have the expected effect?

Yes. Although I half expected it to have no effect in this case.

Or are you
saying that you don't have a position to put the property in that

Also true, probably.

If the former, can you tell on which buffer position you put
the property, and perhaps show a simple reproducer?

(with-current-buffer (get-buffer-create "popup-test.el")
  (setq display-line-numbers t)
  (insert "aaaaaaa

  (let ((ov (make-overlay (point-max) (point-max))))
    (overlay-put ov 'after-string "bbbbbb\nbbbbbb\n")
    (overlay-put ov 'display-line-numbers-disable t)))

After that, the buffer popup-test.el shows the "bbbbbb" lines prepended with the empty line number columns. I'd rather they weren't there.

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