[QGIS-Developer] Switching to KDE fork of Qt for Windows builds?

[Nyall Dawson]

Hi list, (especially Jürgen)

I'm wondering if it's possible to switch over the Windows (osgeo4w)
builds of Qt from the upstream 5.15.2 package over to the (maintained)
KDE 5.15 backports fork. We're missing a bunch of important fixes on
Windows (especially the PDF output related fixes) which are available
in KDE's fork.

Is this a major task to do?

Nyall