emit QScreen::geometryChanged when the logical DPI changes

Origin: upstream, https://code.qt.io/cgit/qt/qtbase.git/commit/?id=5c7307775d32ae0a
Last-Update: 2020-09-30

Add the missing call to QScreenPrivate::emitGeometryChangeSignals()
along with an emission of physicalDotsPerInchChanged()
since that is calculated from geometry and physical size.

Rearrange the code in
QGuiApplicationPrivate::processScreenGeometryChange()
to prevent duplicate emissions of geometryChanged(),
physicalDotsPerInchChanged() which this change would introduce.

Gbp-Pq: Name emit_geometry_changed.diff

qtbase-opensource-src (5.15.1+dfsg-4) unstable; urgency=medium

  [ Alexander Volkov ]
  * Backport upstream patch xcb_screens_uaf.patch in order to fix
    use-after-free in the xcb plugin.

[dgit import unpatched qtbase-opensource-src 5.15.1+dfsg-4]

Import qtbase-opensource-src_5.15.1+dfsg-4.debian.tar.xz

[dgit import tarball qtbase-opensource-src 5.15.1+dfsg-4 qtbase-opensource-src_5.15.1+dfsg-4.debian.tar.xz]

Import qtbase-opensource-src_5.15.1+dfsg.orig.tar.xz

[dgit import orig qtbase-opensource-src_5.15.1+dfsg.orig.tar.xz]