[6.8.1 -> 6.8.2] Thicker text underline with certain fonts (X11)

The "Source Code Pro" .ttf that Qt Creator ships as editor font, renders with a thicker text underline when built against Qt 6.8.2. Up to Qt 6.8.1, the underline had a width of 1px, with 6.8.2 it became 2px (and the distance to the to the base line also increased from 1px to 2px).

The screenshot was made with the attached QTBUG-134626.zip.

This was not observed with other versions of the Source Code Pro font or other fonts.

Edit: Looking at the screenshot more closely, also the glyph rendering is slightly different. Example: While the "o"s in 6.8.2 are identical, they slightly differ in 6.8.1. Overall, the lines are darker in 6.8.2 (as if they match the pixel grid a bit more).