3 files changed, 32 insertions, 0 deletions
diff --git a/src/gui/kernel/qplatformdialoghelper.cpp b/src/gui/kernel/qplatformdialoghelper.cpp
index b787629f6a..6a0adca9ca 100644
--- a/src/gui/kernel/qplatformdialoghelper.cpp
+++ b/src/gui/kernel/qplatformdialoghelper.cpp
@@ -61,6 +61,18 @@ QT_BEGIN_NAMESPACE
 
 */
 
+/*!
+    \enum QPlatformDialogHelper::StyleHint
+
+    This enum type specifies platform-specific style hints.
+
+    \value DialogIsQtWindow Indicates that a platform-specific dialog is implemented
+                            as in-process Qt window. It allows to prevent blocking the
+                            dialog by an invisible proxy Qt dialog.
+
+    \sa styleHint()
+*/
+
 static const int buttonRoleLayouts[2][6][14] =
 {
     // Qt::Horizontal
diff --git a/src/gui/kernel/qplatformdialoghelper.h b/src/gui/kernel/qplatformdialoghelper.h
index 2c050535d8..0832e19dc3 100644
--- a/src/gui/kernel/qplatformdialoghelper.h
+++ b/src/gui/kernel/qplatformdialoghelper.h
@@ -80,6 +80,7 @@ class Q_GUI_EXPORT QPlatformDialogHelper : public QObject
     Q_OBJECT
 public:
     enum StyleHint {
+        DialogIsQtWindow
     };
     enum DialogCode { Rejected, Accepted };
 
diff --git a/src/widgets/dialogs/qdialog.cpp b/src/widgets/dialogs/qdialog.cpp
index 06f0393b4c..cadd7ef031 100644
--- a/src/widgets/dialogs/qdialog.cpp
+++ b/src/widgets/dialogs/qdialog.cpp
@@ -731,6 +731,20 @@ void QDialog::setVisible(bool visible)
     if (!testAttribute(Qt::WA_DontShowOnScreen) && d->canBeNativeDialog() && d->setNativeDialogVisible(visible))
         return;
 
+    // We should not block windows by the invisible modal dialog
+    // if a platform-specific dialog is implemented as an in-process
+    // Qt window, because in this case it will also be blocked.
+    const bool dontBlockWindows = testAttribute(Qt::WA_DontShowOnScreen)
+            && d->styleHint(QPlatformDialogHelper::DialogIsQtWindow).toBool();
+    Qt::WindowModality oldModality;
+    bool wasModalitySet;
+
+    if (dontBlockWindows) {
+        oldModality = windowModality();
+        wasModalitySet = testAttribute(Qt::WA_SetWindowModality);
+        setWindowModality(Qt::NonModal);
+    }
+
     if (visible) {
         if (testAttribute(Qt::WA_WState_ExplicitShowHide) && !testAttribute(Qt::WA_WState_Hidden))
             return;
@@ -797,6 +811,11 @@ void QDialog::setVisible(bool visible)
             d->eventLoop->exit();
     }
 
+    if (dontBlockWindows) {
+        setWindowModality(oldModality);
+        setAttribute(Qt::WA_SetWindowModality, wasModalitySet);
+    }
+
 #if QT_CONFIG(pushbutton)
     const QPlatformTheme *theme = QGuiApplicationPrivate::platformTheme();
     if (d->mainDef && isActiveWindow()