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bug#64166: 29.0.92; A :box with negative vertical width does not avoid a
From: |
Sebastian Miele |
Subject: |
bug#64166: 29.0.92; A :box with negative vertical width does not avoid any increase in the line height |
Date: |
Tue, 20 Jun 2023 18:12:25 +0200 |
Eli Zaretskii <eliz@gnu.org> writes:
>> At the end of the second line, evaluate (‘eval-expression’):
>>
>> (insert (propertize "text" 'face '(:box '(:line-width (-1 . -1)))))
>>
>> The height of the line clearly changes. But that is contrary to what
>> the manual says about the ‘:box’ face attribute:
>>
>> "A negative horizontal or vertical width −N means to draw a line of
>> width N that occupies the space of the underlying text, thus avoiding
>> any increase in the character height or width."
>
> The above is incorrect face specification. Try this instead:
>
> (insert (propertize "text" 'face '(:box (:line-width (-1 . -1)))))
>
>> Apart from that:
>>
>> (1) Using ‘:line-width (-1 . -1)’ seems to yield the exact same result
>> as ‘:line-width (1 . 1)’ does, both in width and in height.
>>
>> (2) Using even larger negative values has no effect.
>> ‘:line-width (-10 . -10)’ also seems to yield the exact same result as
>> ‘:line-width (1 . 1)’ does.
>>
>> Apparantly, all negative values are treates as positive 1, contrary to
>> what the manual states.
>
> What happens if you remove the redundant quote?
Everything works as expected. Sorry for the noise.
All the best!