Titlebar colors broken on Windows 7 classic theme

[ask2018]

SumatraPDF version

• 3.5.2, prerelease

Describe the bug
Title bar is broken on Win7 classic theme (I have themes service fully disabled)

To Reproduce

1. Disable themes service
2. Run the application

Expected behavior
It should be same as on version 3.4.6. This is probably related to the Dark theme introduced in 3.5 version.
I've seen similar issues before on other software: SubtitleEdit/subtitleedit#4812

Screenshots

[kjk]

How does it look in pre-release?

I don't have win7 for testing

[ask2018]

I've included the prerelease 3.6. build 15969 screenshot above as well and there it is as well broken. I don't see never build of prerelease atm, but tested again and still the same.

[kjk]

Ah, missed that, thanks.