isOnActiveSpace is available from 10.6.

The fix for qtcreatorbug-827 included a call to isOnActiveSpace, which
is only available from 10.6 so this patch adds a runtime check for it.
Since it is a runtime check there is no need for multiple builds.
Notice that the fix for qtcreatorbug-827 will work only on 10.6+

Task-number: QTCREATORBUG-827
Reviewed-by: Richard Moe Gustavsen

1 files changed, 14 insertions, 7 deletions

diff --git a/src/gui/kernel/qwidget_mac.mm b/src/gui/kernel/qwidget_mac.mm
index 81dd746..f12c956 100644
--- a/src/gui/kernel/qwidget_mac.mm
+++ b/src/gui/kernel/qwidget_mac.mm
@@ -3835,13 +3835,20 @@ void QWidgetPrivate::raise_sys()
         // required we will introduce special handling for some of them.
         if (!q->testAttribute(Qt::WA_DontShowOnScreen) && q->isVisible()) {
             OSWindowRef window = qt_mac_window_for(q);
-            if(![window isOnActiveSpace]) {
-                QWidget *parentWidget = q->parentWidget();
-                if(parentWidget) {
-                    OSWindowRef parentWindow = qt_mac_window_for(parentWidget);
-                    if(parentWindow && [parentWindow isOnActiveSpace]) {
-                        recreateMacWindow();
-                        window = qt_mac_window_for(q);
+            // isOnActiveSpace is available only from 10.6 onwards, so we need to check if it is
+            // available before calling it.
+            if([window respondsToSelector:@selector(isOnActiveSpace)]) {
+                if(![window performSelector:@selector(isOnActiveSpace)]) {
+                    QWidget *parentWidget = q->parentWidget();
+                    if(parentWidget) {
+                        OSWindowRef parentWindow = qt_mac_window_for(parentWidget);
+                        if(parentWindow && [parentWindow isOnActiveSpace]) {
+                            // The window was created in a different space. Therefore if we want
+                            // to show it in the current space we need to recreate it in the new
+                            // space.
+                            recreateMacWindow();
+                            window = qt_mac_window_for(q);
+                        }
                     }
                 }
             }