Sender and subject are not bold in the message list on Windows

The Problem

Sender and subject are not bold in the message list on Windows.

Proposed Solution

Sender and subject are in bold font in the message list on Windows.

Alternative Solutions

Context

This is fixed in Mailspring 1.20.0! The root cause was that Windows was not correctly applying CSS font-weight: bold values in certain contexts — we’ve switched to CSS variables for font weight and applied a slightly heavier styling on Windows, where the system font doesn’t have a “600” weight, which resolves the rendering issue. Update and the bold text in the message list should be back.