DrRacket Log fails to load due to an exception

[Fictitious-Rotor]

Unable to open the log due to the following error:

color-prefs:lookup-in-color-scheme: contract violation
  expected: known-color-scheme-name?
  given: 'framework:failed-background-color
  in: the name argument of
      (->i
       ((name known-color-scheme-name?))
       (result
        (name)
        (if (... name)
          (is-a?/c style-delta%)
          (is-a?/c color%))))
  contract from: 
      <pkgs>/gui-lib/framework/main.rkt
  blaming: <pkgs>/drracket/drracket/private/unit.rkt
   (assuming the contract is correct)
  at: <pkgs>/gui-lib/framework/main.rkt:2095.2

Instructions to repeat:

1. Launch DrRacket
2. Menu: View -> Show Log
3. Error occurs

[rfindler]

I think this was fixed in 3e50572 .

[sorawee]

@Fictitious-Rotor what version of Racket are you using? @rfindler suggests that the problem is already fixed in 7.8. Can you download it and see if there's still an issue?

[Fictitious-Rotor]

Apologies for the slow response regarding this - using version v7.8 did indeed resolve this issue.

I didn't respond immediately because I encountered a related issue and wasn't sure if this too was an end user issue.

While using dark theme, text in the log remains the same shade of black as the backdrop, meaning that it's impossible to read.
The rest of the log window also remains in the light theme.

[rfindler]

I'm not sure what commit exactly fixed this one, but it appears to be working for me in the release candidate for 7.9: https://pre-release.racket-lang.org/

[Fictitious-Rotor]

Using version 7.8.0.900 I find the issue to still be present, I'm afraid.
The issue persists for dark theme and even into light theme until the log-level text box is emptied and filled again.

[rfindler]

Just to confirm: when you switch to dark mode, the colors don't switch appropriately, but if you start up when you are already in dark mode, then it looks okay?

[Fictitious-Rotor]

Hopefully this video will explain what I'm experiencing

[sorawee]

That looks bad.

I use a dark theme too but I cannot reproduce the problem.

The issue persists for dark theme and even into light theme until the log-level text box is emptied and filled again.

FWIW, I think this is kinda expected. When you load a new theme, you should restart DrRacket to get it 100% working correctly.

[rfindler]

I've not had a real chance to investigate but this might be windows specific, as that control's text might actually be being drawn by windows (and telling windows that the controls need to be drawn in dark mode isn't really a supported API, annoyingly).