1 files changed, 14 insertions, 0 deletions
diff --git a/src/gui/kernel/qwidget_mac.mm b/src/gui/kernel/qwidget_mac.mm
index 6d3da61..6524bc9 100644
--- a/src/gui/kernel/qwidget_mac.mm
+++ b/src/gui/kernel/qwidget_mac.mm
@@ -728,6 +728,7 @@ static OSWindowRef qt_mac_create_window(QWidget *, WindowClass wclass, WindowAtt
 static EventTypeSpec window_events[] = {
     { kEventClassWindow, kEventWindowClose },
     { kEventClassWindow, kEventWindowExpanded },
+    { kEventClassWindow, kEventWindowHidden },
     { kEventClassWindow, kEventWindowZoomed },
     { kEventClassWindow, kEventWindowCollapsed },
     { kEventClassWindow, kEventWindowToolbarSwitchMode },
@@ -997,6 +998,19 @@ OSStatus QWidgetPrivate::qt_window_event(EventHandlerCallRef er, EventRef event,
                     }
                 }
             }
+        } else if (ekind == kEventWindowHidden) {
+            // Make sure that we also hide any visible sheets on our window.
+            // Cocoa does the right thing for us.
+            const QObjectList children = widget->children();
+            const int childCount = children.count();
+            for (int i = 0; i < childCount; ++i) {
+                QObject *obj = children.at(i);
+                if (obj->isWidgetType()) {
+                    QWidget *widget = static_cast<QWidget *>(obj);
+                    if (qt_mac_is_macsheet(widget) && widget->isVisible())
+                        widget->hide();
+                }
+            }
         } else {
             handled_event = false;
         }