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diff -up qt-everywhere-opensource-src-4.8.2/tools/assistant/tools/assistant/mainwindow.cpp.me qt-everywhere-opensource-src-4.8.2/tools/assistant/tools/assistant/mainwindow.cpp
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--- qt-everywhere-opensource-src-4.8.2/tools/assistant/tools/assistant/mainwindow.cpp.me	2012-06-19 12:52:22.740180410 +0200
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+++ qt-everywhere-opensource-src-4.8.2/tools/assistant/tools/assistant/mainwindow.cpp	2012-06-19 12:52:51.953194103 +0200
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@@ -944,8 +944,7 @@ void MainWindow::updateApplicationFont()
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     if (helpEngine.usesAppFont())
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         font = helpEngine.appFont();
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-    const QWidgetList &widgets = qApp->allWidgets();
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-    foreach (QWidget* widget, widgets)
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+    foreach (QWidget* widget, QApplication::allWidgets())
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         widget->setFont(font);
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 }
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