Avoid use-after-free in QXcbConnection::initializeScreens()

Origin: upstream, https://code.qt.io/cgit/qt/qtbase.git/commit/?id=86b8c5c3f32c2457
Last-Update: 2020-11-23

Gbp-Pq: Name xcb_screens_uaf.patch

qtbase-opensource-src (5.15.2+dfsg-9+deb11u2) bullseye-security; urgency=high

  * Non-maintainer upload by the LTS Security Team.
  * CVE-2024-39936: issue in HTTP2. Code to make security-relevant
    decisions about an established connection may execute too early,
    because the encrypted() signal has not yet been emitted and
    processed.
  * Add Salsa-CI configuration
  * Add git-buildpackage configuration
  * Add lintian overrides for test binary data

[dgit import unpatched qtbase-opensource-src 5.15.2+dfsg-9+deb11u2]

Import qtbase-opensource-src_5.15.2+dfsg-9+deb11u2.debian.tar.xz

[dgit import tarball qtbase-opensource-src 5.15.2+dfsg-9+deb11u2 qtbase-opensource-src_5.15.2+dfsg-9+deb11u2.debian.tar.xz]

Import qtbase-opensource-src_5.15.2+dfsg.orig.tar.xz

[dgit import orig qtbase-opensource-src_5.15.2+dfsg.orig.tar.xz]