From 6cf44bf690cf0a84325b78d871a96c009b2513ec Mon Sep 17 00:00:00 2001
From: Johan Klokkhammer Helsing <johan.helsing@qt.io>
Date: Wed, 18 Oct 2017 11:05:48 +0200
Subject: [PATCH] Fix crash when wl-shell setType is called with a hidden
 parent

Fall back to creating a toplevel instead

Change-Id: If7db27d08b79e4f9f8c82fa8f9bf73abdb2585d9
Reviewed-by: David Edmundson <davidedmundson@kde.org>
Reviewed-by: Paul Olav Tvete <paul.tvete@qt.io>
---
 .../wayland/qwaylandwlshellsurface.cpp        |  6 ++-
 tests/auto/wayland/client/tst_client.cpp      | 44 +++++++++++++++++++
 2 files changed, 48 insertions(+), 2 deletions(-)

diff --git a/src/plugins/platforms/wayland/qwaylandwlshellsurface.cpp b/src/plugins/platforms/wayland/qwaylandwlshellsurface.cpp
index 77434e98b6c..92223f45ee6 100644
--- a/src/plugins/platforms/wayland/qwaylandwlshellsurface.cpp
+++ b/src/plugins/platforms/wayland/qwaylandwlshellsurface.cpp
@@ -185,6 +185,7 @@ void QWaylandWlShellSurface::updateTransientParent(QWindow *parent)
             || testShowWithoutActivating(m_window->window()))
         flags |= WL_SHELL_SURFACE_TRANSIENT_INACTIVE;
 
+    Q_ASSERT(parent_wayland_window->object());
     set_transient(parent_wayland_window->object(),
                   transientPos.x(),
                   transientPos.y(),
@@ -211,15 +212,16 @@ void QWaylandWlShellSurface::setPopup(QWaylandWindow *parent, QWaylandInputDevic
         transientPos.setY(transientPos.y() + parent_wayland_window->decoration()->margins().top());
     }
 
+    Q_ASSERT(parent_wayland_window->object());
     set_popup(device->wl_seat(), serial, parent_wayland_window->object(),
               transientPos.x(), transientPos.y(), 0);
 }
 
 void QWaylandWlShellSurface::setType(Qt::WindowType type, QWaylandWindow *transientParent)
 {
-    if (type == Qt::Popup && transientParent)
+    if (type == Qt::Popup && transientParent && transientParent->object())
         setPopup(transientParent, m_window->display()->lastInputDevice(), m_window->display()->lastInputSerial());
-    else if (transientParent)
+    else if (transientParent && transientParent->object())
         updateTransientParent(transientParent->window());
     else
         setTopLevel();
diff --git a/tests/auto/wayland/client/tst_client.cpp b/tests/auto/wayland/client/tst_client.cpp
index 8acddfbe740..1eee90f49db 100644
--- a/tests/auto/wayland/client/tst_client.cpp
+++ b/tests/auto/wayland/client/tst_client.cpp
@@ -143,6 +143,8 @@ private slots:
     void touchDrag();
     void mouseDrag();
     void dontCrashOnMultipleCommits();
+    void hiddenTransientParent();
+    void hiddenPopupParent();
 
 private:
     MockCompositor *compositor;
@@ -360,6 +362,48 @@ void tst_WaylandClient::dontCrashOnMultipleCommits()
     QTRY_VERIFY(!compositor->surface());
 }
 
+void tst_WaylandClient::hiddenTransientParent()
+{
+    QWindow parent;
+    QWindow transient;
+
+    transient.setTransientParent(&parent);
+
+    parent.show();
+    QTRY_VERIFY(compositor->surface());
+
+    parent.hide();
+    QTRY_VERIFY(!compositor->surface());
+
+    transient.show();
+    QTRY_VERIFY(compositor->surface());
+}
+
+void tst_WaylandClient::hiddenPopupParent()
+{
+    TestWindow toplevel;
+    toplevel.show();
+
+    // wl_shell relies on a mouse event in order to send a serial and seat
+    // with the set_popup request.
+    QSharedPointer<MockSurface> surface;
+    QTRY_VERIFY(surface = compositor->surface());
+    QPoint mousePressPos(16, 16);
+    QCOMPARE(toplevel.mousePressEventCount, 0);
+    compositor->sendMousePress(surface, mousePressPos);
+    QTRY_COMPARE(toplevel.mousePressEventCount, 1);
+
+    QWindow popup;
+    popup.setTransientParent(&toplevel);
+    popup.setFlag(Qt::Popup, true);
+
+    toplevel.hide();
+    QTRY_VERIFY(!compositor->surface());
+
+    popup.show();
+    QTRY_VERIFY(compositor->surface());
+}
+
 int main(int argc, char **argv)
 {
     setenv("XDG_RUNTIME_DIR", ".", 1);