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-10) unstable; urgency=medium

  [ Lu Yaning ]
  * Restore fix-misplacement-of-placeholder-text-in-QLineEdit.diff.
  * Backport upstream patch to fix the regression with placement of
    placeholder text in QLineEdits with action icons.

  [ Dmitry Shachnev ]
  * Backport upstream patch to fix icon display on checkable QPushButtons
    with Fusion style (closes: #991255).
  * Backport upstream patch to remove MySQL version checks, which led to
    wrong conclusions with MariaDB Connector ≥ 3.2.
  * Backport upstream patch to fix QTextFormat::FullWidthSelection for
    right-to-left text layouts.

[dgit import unpatched qtbase-opensource-src 5.15.2+dfsg-10]

Import qtbase-opensource-src_5.15.2+dfsg-10.debian.tar.xz

[dgit import tarball qtbase-opensource-src 5.15.2+dfsg-10 qtbase-opensource-src_5.15.2+dfsg-10.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]