> That comes from Qt, the toolkit calibre uses.
That's lucky.
Retesting with the native Wayland backend today after almost a full year (didn't expect it to work based on the overly friendly response, so didn't test until now) Calibre Viewer seems to render now, seemingly even correctly.
I suppose the ton of Wayland-related fixes that were shipped in Qt6 made things usable at some point, combined with the fact Calibre thankfully isn't lagging behind on Qt5.
Tested on Plasma(kwin) 5.27.10, Calibre 7.4, Qt 6.6.1 and a Nvidia series 4000 using the 545.29.06 driver.
Presumably people on Debian will have it working only on the new release (years away), but Ubuntu and its based distributions (i.e. person on Mint from yesterday) should start working properly when 24.04 ships, presumably sometime early May along with extra months for downstream adaptation.
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