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qutebrowser: downgrade Qt to 5.14 #99456
Motivation for this change
There are a number of unresolved issues with Qt 5.15, the most
FWIW other than the session support, I think all of those issues are either fixed in Qt 5.15.1 (or .2), or just not relevant outside of qutebrowser development. The only other remaining issue with Qt 5.15.1 are renderer process crashes which can be fixed by backporting this patch: [Backport] Fix for bug 1071327 (Icf418990) · Gerrit Code Review
As for the session support, the choice is between being able to fully restore sessions or having security patches:
IMHO, for a web browser, lagging behind more than absolutely necessary with security patches is a bigger problem than not getting back-/forward history after restoring sessions.
For security reasons  we upgrade to the latest Qt, despite this breaking a feature, which is why 5.14 was forced earlier.  NixOS#99456 (comment)