Group separator does not change background on dark mode

[ken-salterdiazsolutions]

Describe the bug
When setting theme to dark mode, the group separator background color remains at white, and this makes the text almost impossible to read. I should mention this is with useStickyGroupSeparators = true. The issue is with the sticky group separator .

Expected behavior
When setting theme to dark mode, the sticky group separator background color should be the same as the dark mode theme background color (or transparent)

Information:

• Dart version: 2.18.4
• Flutter version: 3.3.8
• Platform: Android
• Package version: 5.1.2