bug#54196: 29.0.50; flat-button face box style does not work as expected

[David Ponce <da_vid@orange.fr>]

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On 28/02/2022 10:58, Lars Ingebrigtsen wrote:
> David Ponce <da_vid@orange.fr> writes:
> 
>> I noticed that the :box :style flat-button is not working as expected:
>> the line around the text seems to be there, but not visible.
>>
>> Just evaluate the below code in the scratch buffer will show the
>> problem:
>>
>> (insert
>>   (propertize "This buffer is for text"
>> 	     'font-lock-face
>> 	     '( :box ( :line-width (4 . 4)
>> 		       :color "dark grey"
>> 		       :style pressed-button)))
>>   "\n"
>>   (propertize "This buffer is for text"
>> 	     'font-lock-face
>> 	     '( :box ( :line-width (4 . 4)
>> 		       :color "dark grey"
>> 		       :style released-button)))
>>   "\n"
>>   (propertize "This buffer is for text"
>> 	     'font-lock-face
>> 	     '( :box ( :line-width (4 . 4)
>> 		       :color "dark grey"
>> 		       :style flat-button)))
>>   "\n"
>>   )
> 
> I'm not sure what I'm supposed to be looking for here.  Can you include
> some screenshots and point to what you think is the problem?
> 
My example above to illustrate the issue, inserts 3 lines with the same text in the scratch buffer:

1st line with a gray pressed-button box around the text. Work as expected.
2nd line with a gray released-button box around the text. Work as expected.
3rd line with a gray flat-button box around the text. Doesn' work as expected. The gray line around the text is not visible.

I attached a screen shot.


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