Boder of Frame inset not visible in dark mode

[Daniel]

On 2023-09-26 04:26, Daniel wrote:
> On 2023-09-24 22:24, Dan wrote:
>> Hello,
>>
>> PROBLEM
>> ========
>> There is a frame whose outline is not visible in dark mode because it 
>> is black (Insert > Frame > Simple Frame).
>> The box inset name is "Boxed" 
>> (https://www.lyx.org/trac/browser/lyxgit/lib/layouts/stdinsets.inc#L504).
>>
>> See the attached image for a showcase of all the frames showing the 
>> problem.
>>
>> EXPECTED BEHAVIOUR
>> ===================
>> Simple Frame Box should have the same outline colour as the other frames.
> 
> A bug here that wpuld solve the problem is that the frame setting misses 
> the proper "Default" value for its frame color.
> 
> When inserted, no special color is applied to the frame but the frame 
> color is used. You can see this by changing the Main Text color (in 
> Document Settings > Colors). If the default is changed to, say, red, the 
> box gets that color in the output but still has "black" as frame color 
> in the settings. Worse, once one changes the color in the frame settings 
> to, say, blue, it is impossible to get the default behavior back since 
> when switching back to "black", it is explicitly applied.
> 
> Daniel

Filed as #12921. (Hopefully with a better description than here.)

Daniel