User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4299.0 Safari/537.36 Edg/88.0.688.0
Steps to reproduce:
- Enable high-contrast mode in Windows 10, by doing the following:
1.1. Open Windows Settings (Windows+I).
1.2. Go to Ease of access -> High-contrast.
1.3. Turn on the high-contrast mode, using the respective toggle.
1.4. From the "High-contrast theme" combo-box, select "High-Contrast Black".
- Launch Thunderbird.
- Invoke some dialogs/windows (e.g. IMAP folder properties, Message Filtering, Add Existing Account, etc.).
- Take a look at the 4th screenshot in the attached archive, named "004_IE_Tabs-Options.png".
- Compair how the controls in the Thunderbird dialogs/windows look in high-contrast black mode in comparison with the ones in the "Tabbed browsing settings" dialog for IE, taken from Control Panel ➡ internet Options ➡ "General" tab ➡ "Tabs" button.
The controls in Thunderbird's dialogs/windows use a flat UI even in high-contrast mode, but they should not as Windows does not. Not using a flat UI provides better contrast, by adding contours to the controls.
Thunderbird's dialogs/windows should not use a flat UI in high-contrast mode, so they can provide better contrast.