GNU bug report logs - #25856
25.1; after-string of overlay may not be displayed

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Eli Zaretskii <eliz <at> gnu.org>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#25856: closed (25.1; after-string of overlay may not be
 displayed)
Date: Fri, 24 Feb 2017 08:36:02 +0000

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Your message dated Fri, 24 Feb 2017 10:34:17 +0200
with message-id <83r32ornqu.fsf <at> gnu.org>
and subject line Re: bug#25856: 25.1; after-string of overlay may not be displayed
has caused the debbugs.gnu.org bug report #25856,
regarding 25.1; after-string of overlay may not be displayed
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


-- 
25856: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=25856
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From: ynyaaa <at> gmail.com
To: bug-gnu-emacs <at> gnu.org
Subject: 25.1; after-string of overlay may not be displayed
Date: Fri, 24 Feb 2017 15:19:06 +0900

Evaluating the form below, I expect to see 4 <BeforeAfter>.
It displays 3 <Before> and 1 <BeforeAfter>.
If before-string is not specified, 4 <After> are displayed.

(dotimes (i 4)
  (let ((p (point)) ol)
    (insert "<HIDDEN>\n")
    (setq ol (make-overlay (1+ p) (- (point) 2)))
    (cond ((= i 0) (overlay-put ol 'display ""))
          ((= i 1) (overlay-put ol 'invisible t))
          ((= i 2) (put-text-property (1+ p) (- (point) 2) 'display ""))
          ((= i 3) (put-text-property (1+ p) (- (point) 2) 'invisible t)))
    (overlay-put ol 'before-string "Before")
    (overlay-put ol 'after-string  "After")
    (overlay-put ol 'evaporate t)))




In GNU Emacs 25.1.1 (i686-w64-mingw32)
 of 2016-09-18 built on LAPHROAIG
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From: Eli Zaretskii <eliz <at> gnu.org>
To: ynyaaa <at> gmail.com
Cc: 25856-done <at> debbugs.gnu.org
Subject: Re: bug#25856: 25.1; after-string of overlay may not be displayed
Date: Fri, 24 Feb 2017 10:34:17 +0200

tags 25856 notabug
thanks

> From: ynyaaa <at> gmail.com
> Date: Fri, 24 Feb 2017 15:19:06 +0900
> 
> Evaluating the form below, I expect to see 4 <BeforeAfter>.
> It displays 3 <Before> and 1 <BeforeAfter>.
> If before-string is not specified, 4 <After> are displayed.
> 
> (dotimes (i 4)
>   (let ((p (point)) ol)
>     (insert "<HIDDEN>\n")
>     (setq ol (make-overlay (1+ p) (- (point) 2)))
>     (cond ((= i 0) (overlay-put ol 'display ""))
>           ((= i 1) (overlay-put ol 'invisible t))
>           ((= i 2) (put-text-property (1+ p) (- (point) 2) 'display ""))
>           ((= i 3) (put-text-property (1+ p) (- (point) 2) 'invisible t)))
>     (overlay-put ol 'before-string "Before")
>     (overlay-put ol 'after-string  "After")
>     (overlay-put ol 'evaporate t)))

I don't see any bug here.  You are making text disappear using
different methods, and each one has its implications wrt before- and
after-string.

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