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Subject: bug#40857: Invisibility specs do not apply to specified spaces
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Consider the following program:

(with-current-buffer (get-buffer-create "*spaces*")
  (erase-buffer)
  (let ((indent (propertize " " 'display '(space :width 3))))
    (put-text-property (point) (progn (insert indent "r1\n") (point)) 'invisible 'a)
    (put-text-property (point) (progn (insert indent "r2\n") (point)) 'invisible 'b))
  (add-to-invisibility-spec 'a)
  (pop-to-buffer (current-buffer)))

The first record (r1) is hidden, but not the indentation that precedes it; so, instead of looking like this:

   r2

The buffer looks like this:

      r2

(This is because the invisible property doesn't apply to the display spec.)
It's easy to fix when the replacing display spec is a string (by putting the same invisibility spec on the string), but there doesn't seem to be a way to add an 'invisible property to the specified space.

Clément

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To: =?UTF-8?Q?Cl=C3=A9ment?= Pit-Claudel <cpitclaudel@HIDDEN>
Subject: bug#40857: Acknowledgement (Invisibility specs do not apply to
 specified spaces)
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Subject: bug#40857: Invisibility specs do not apply to specified spaces
Resent-From: Eli Zaretskii <eliz@HIDDEN>
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Date: Sun, 26 Apr 2020 18:20:55 +0300
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From: Eli Zaretskii <eliz@HIDDEN>
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 =?UTF-8?Q?Cl=C3=A9ment?= Pit-Claudel on Sat, 25 Apr 2020 19:18:55 -0400)
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> From: Clément Pit-Claudel <cpitclaudel@HIDDEN>
> Date: Sat, 25 Apr 2020 19:18:55 -0400
> 
> Consider the following program:
> 
> (with-current-buffer (get-buffer-create "*spaces*")
>   (erase-buffer)
>   (let ((indent (propertize " " 'display '(space :width 3))))
>     (put-text-property (point) (progn (insert indent "r1\n") (point)) 'invisible 'a)
>     (put-text-property (point) (progn (insert indent "r2\n") (point)) 'invisible 'b))
>   (add-to-invisibility-spec 'a)
>   (pop-to-buffer (current-buffer)))
> 
> The first record (r1) is hidden, but not the indentation that precedes it; so, instead of looking like this:
> 
>    r2
> 
> The buffer looks like this:
> 
>       r2

I don't think this is a bug.  A "replacing" display property in effect
forces the display engine to ignore the entire chunk of text "covered"
by that display property, so the fact that this chunk of text is in
this case invisible is never seen, nor acted upon.  Once the display
engine is done producing the stretch of white space for the display
property, it jumps to the end of the text "covered" by the property,
and continues from there.

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Subject: bug#40857: Invisibility specs do not apply to specified spaces
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From: =?UTF-8?Q?Cl=C3=A9ment?= Pit-Claudel <cpitclaudel@HIDDEN>
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On 26/04/2020 11.20, Eli Zaretskii wrote:
>> From: Clément Pit-Claudel <cpitclaudel@HIDDEN>
>> Date: Sat, 25 Apr 2020 19:18:55 -0400
>>
>> Consider the following program:
>>
>> (with-current-buffer (get-buffer-create "*spaces*")
>>   (erase-buffer)
>>   (let ((indent (propertize " " 'display '(space :width 3))))
>>     (put-text-property (point) (progn (insert indent "r1\n") (point)) 'invisible 'a)
>>     (put-text-property (point) (progn (insert indent "r2\n") (point)) 'invisible 'b))
>>   (add-to-invisibility-spec 'a)
>>   (pop-to-buffer (current-buffer)))
>>
>> The first record (r1) is hidden, but not the indentation that precedes it; so, instead of looking like this:
>>
>>    r2
>>
>> The buffer looks like this:
>>
>>       r2
> 
> I don't think this is a bug.

Indeed not. As I said in the original method, and as you summarized: (This is because the invisible property doesn't apply to the display spec.)
The feature request is to have a way to add an invisible property to specified spaces.

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severity 40857 wishlist
thanks

> Cc: 40857 <at> debbugs.gnu.org
> From: Clément Pit-Claudel <cpitclaudel@HIDDEN>
> Date: Sun, 26 Apr 2020 12:04:43 -0400
> 
> > I don't think this is a bug.
> 
> Indeed not. As I said in the original method, and as you summarized: (This is because the invisible property doesn't apply to the display spec.)

Not because it doesn't apply to the display spec, because it at all is
not considered when a display property is on the same text as
invisible property.

> The feature request is to have a way to add an invisible property to specified spaces.

Ah, okay.  Didn't realize this was a feature request.

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Subject: Re: bug#40857: Invisibility specs do not apply to specified spaces
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severity 40857 wishlist
thanks

> Cc: 40857 <at> debbugs.gnu.org
> From: Clément Pit-Claudel <cpitclaudel@HIDDEN>
> Date: Sun, 26 Apr 2020 12:04:43 -0400
> 
> > I don't think this is a bug.
> 
> Indeed not. As I said in the original method, and as you summarized: (This is because the invisible property doesn't apply to the display spec.)

Not because it doesn't apply to the display spec, because it at all is
not considered when a display property is on the same text as
invisible property.

> The feature request is to have a way to add an invisible property to specified spaces.

Ah, okay.  Didn't realize this was a feature request.

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On 26/04/2020 13.01, Eli Zaretskii wrote:
>> The feature request is to have a way to add an invisible property to specified spaces.
> 
> Ah, okay.  Didn't realize this was a feature request.

Sorry, it's because I wasn't clear.  Specified spaces are very convenient for displaying tabulated lists, and the buffer-invisibility-spec is supposed to be particularly useful for displaying database records, but in practice these two don't work together.  It would be great if they did.

Last modified: Sun, 26 Apr 2020 17:30:02 UTC

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