Merge remote-tracking branch 'origin/5.15' into dev

Change-Id: I129dd579f92cb2592a38ca043472b45cb926ae12

2 files changed, 6 insertions, 4 deletions

diff --git a/src/widgets/kernel/qopenglwidget.cpp b/src/widgets/kernel/qopenglwidget.cpp
index 451b18d8d3..bc5ca21b97 100644
--- a/src/widgets/kernel/qopenglwidget.cpp
+++ b/src/widgets/kernel/qopenglwidget.cpp
@@ -788,10 +788,12 @@ void QOpenGLWidgetPrivate::initialize()
     if (initialized)
         return;
 
-    // Get our toplevel's context with which we will share in order to make the
-    // texture usable by the underlying window's backingstore.
+    // If no global shared context get our toplevel's context with which we
+    // will share in order to make the texture usable by the underlying window's backingstore.
     QWidget *tlw = q->window();
-    QOpenGLContext *shareContext = get(tlw)->shareContext();
+    QOpenGLContext *shareContext = qt_gl_global_share_context();
+    if (!shareContext)
+        shareContext = get(tlw)->shareContext();
     // If shareContext is null, showing content on-screen will not work.
     // However, offscreen rendering and grabFramebuffer() will stay fully functional.
 
diff --git a/src/widgets/kernel/qwidget.cpp b/src/widgets/kernel/qwidget.cpp
index 49636fa5d1..65b3326387 100644
--- a/src/widgets/kernel/qwidget.cpp
+++ b/src/widgets/kernel/qwidget.cpp
@@ -7664,7 +7664,7 @@ void QWidget::show()
     else if (defaultState == Qt::WindowMaximized)
         showMaximized();
     else
-        setVisible(true); // FIXME: Why not showNormal(), like QWindow::show()?
+        setVisible(true); // Don't call showNormal() as not to clobber Qt::Window(Max/Min)imized
 }
 
 /*! \internal