When a screen comes back online, the windows need to be told about it (QTBUG-47041)

qt5-qtbase-QTBUG-47041.patch

@@ -0,0 +1,45 @@
+From b0b08cc0e4e38504d6b833702f7477aee4e2a192 Mon Sep 17 00:00:00 2001
+From: Ralf Jung <post@ralfj.de>
+Date: Sun, 5 Jul 2015 12:15:29 +0200
+Subject: [PATCH] When a screen comes back online, the windows need to be told
+ about it
+
+On my system, this fixes the misbehavior of Qt applications when the (only) active screen is
+switched, e.g. from an external screen to the laptop.
+This behavior is caused by the screen() of widgets to be set to NULL when their screen goes away.
+When a new screen comes online, the widgets *should* be told about it, but they are not. The only
+place that "maybeSetScreen" is called is when an existing screen changes its geometry, but not
+when a screen gets enabled without its geometry being affected in any way (e.g. because it was
+just disabled via xrandr, but has been connected all along). This makes sure that "maybeSetScreen"
+is also called when a screen gets enabled.
+
+Task-number: QTBUG-47041
+Change-Id: Ic72d6beaa544bf9a4efdbea0830b1bc0d6ce5362
+Reviewed-by: Dmitry Shachnev <mitya57@gmail.com>
+Reviewed-by: Shawn Rutledge <shawn.rutledge@theqtcompany.com>
+---
+ src/plugins/platforms/xcb/qxcbconnection.cpp | 8 ++++++++
+ 1 file changed, 8 insertions(+)
+
+diff --git a/src/plugins/platforms/xcb/qxcbconnection.cpp b/src/plugins/platforms/xcb/qxcbconnection.cpp
+index 74f48b0..0867615 100644
+--- a/src/plugins/platforms/xcb/qxcbconnection.cpp
++++ b/src/plugins/platforms/xcb/qxcbconnection.cpp
+@@ -252,6 +252,14 @@ void QXcbConnection::updateScreens(const xcb_randr_notify_event_t *event)
+                         otherScreen->addVirtualSibling(screen);
+                 m_screens << screen;
+                 QXcbIntegration::instance()->screenAdded(screen, screen->isPrimary());
++
++                // Windows which had null screens have already had expose events by now.
++                // They need to be told the screen is back, it's OK to render.
++                foreach (QWindow *window, QGuiApplication::topLevelWindows()) {
++                    QXcbWindow *xcbWin = static_cast<QXcbWindow*>(window->handle());
++                    if (xcbWin)
++                        xcbWin->maybeSetScreen(screen);
++                }
+             }
+             // else ignore disabled screens
+         } else if (screen) {
+-- 
+2.3.5
+

qt5-qtbase.spec

@@ -44,7 +44,7 @@
 Summary: Qt5 - QtBase components
 Name:    qt5-qtbase
 Version: 5.5.0
-Release: 17%{?dist}
+Release: 18%{?dist}
 
 # See LGPL_EXCEPTIONS.txt, for exception details
 License: LGPLv2 with exceptions or GPLv3 with exceptions
@@ -108,6 +108,10 @@ Patch53: qtbase-opensource-src-5.4.1-QTBUG-45484.patch
 # 'make docs' crash on el6, use qSort instead of std::sort
 Patch100: qtbase-opensource-src-5.4.0-QTBUG-43057.patch
 
+# https://codereview.qt-project.org/#/c/120700/
+# http://bugreports.qt.io/browse/QTBUG-47041
+Patch101: qt5-qtbase-QTBUG-47041.patch
+
 # https://bugreports.qt.io/browse/QTBUG-46310
 #SM_CLIENT_ID property is not set
 Patch223: 0123-xcb-set-SM_CLIENT_ID-property.patch
@@ -385,6 +389,7 @@ rm -fv mkspecs/linux-g++*/qmake.conf.multilib-optflags
 %if 0%{?rhel} == 6
 %patch100 -p1 -b .QTBUG-43057
 %endif
+%patch101 -p1 -b .QTBUG-47041
 %patch155 -p1 -b .0055
 %patch223 -p1 -b .QTBUG-46310
 
@@ -943,6 +948,9 @@ fi
 
 
 %changelog
+* Mon Oct 05 2015 Rex Dieter <rdieter@fedoraproject.org> 5.5.0-18
+- When a screen comes back online, the windows need to be told about it (QTBUG-47041)
+
 * Wed Aug 19 2015 Rex Dieter <rdieter@fedoraproject.org> 5.5.0-17
 - unconditionally undo valgrind hack when done (#1255054)