Description:
I use a high-contrast theme on Windows 10 since I am visually impaired. Up through Version 5.4.7 of Libreoffice, when I selected the "Automatically detect high-contrast mode" option in the Options dialogue the entire interface reflected the high-contrast mode of my system (black background, yellow test). However, since Libreoffice 6.0 (including Libreoffice 6.1), when I have this option selected the top toolbars and menubar have a white background and no text is visible on the menubar (which suggests that the text is yellow, as it should be, and thus is not visible against the white background). I have gone into the "Application Colors" menu and the Application Background color is displayed as black (labeled as "Automatic"). I can provide screenshots of the issue if this would help.

Steps to Reproduce:
1. Enable high-contrast mode in Windows 10
2. Open Libreoffice and go to Tools -> Options -> Accessability and enable "Automatically detect high contrast mode of operating system".
3. Restart Libreoffice and open any application (i.e. Writer or Calc).
4. You shold encounter the issue.

Actual Results:
Menubar and toolbars have white background and (apparently) yellow text

Expected Results:
Menubar and toolbars should have black background & hellow text to match the system's high contrast mode.


Reproducible: Always


User Profile Reset: Yes


OpenGL enabled: Yes

Additional Info:
[Information automatically included from LibreOffice]
Locale: en-US
Module: SpreadsheetDocument
[Information guessed from browser]
OS: Windows (All)
OS is 64bit: yes