QSslCertificate::verify() has an undocumented and not very desirable property -
on some platorms it updates the default configuration, which can be surprising.
For example, we deprecated QSslSocket::setDefaultCaCertificates() and recommend
using QSslConfiguration::defaultConfiguration(), QSslConfiguration::setDefaultConfiguration(),
and QSslConfiguration::setCaCertificates(). If an application does this to select
CA roots it trusts explicitly, and then for some reason is calling verify, the
application can have its QSslSockets successfully connecting to a host, whose
root was not trusted by the application. Also, on Windows, defaultCaCertificates()
include system roots already, no need to have them twice.
[ChangeLog][QtCore][QtNetwork] QSslSocket::verify - do not change the default configuration
Pick-to: 5.15
Pick-to: 6.0
Pick-to: 6.0.0
Fixes: QTBUG-88639
Change-Id: I1cd40b259d0a6dcd15c78d1e7c027ff10859595c
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>
1158ff67b4