Fix crash when filtering in the preferences.

Need to ensure creation of all tabs before even the proxy model is
informed.

Task-number: QTCREATORBUG-4272
Reviewed-by: Robert Loehning

src/plugins/coreplugin/dialogs/settingsdialog.cpp

@@ -318,6 +318,8 @@ SettingsDialog::SettingsDialog(QWidget *parent) :
 
     // The order of the slot connection matters here, the filter slot
     // opens the matching page after the model has filtered.
+    connect(m_filterLineEdit, SIGNAL(filterChanged(QString)),
+            this, SLOT(ensureAllCategoryWidgets()));
     connect(m_filterLineEdit, SIGNAL(filterChanged(QString)),
                 m_proxyModel, SLOT(setFilterFixedString(QString)));
     connect(m_filterLineEdit, SIGNAL(filterChanged(QString)), this, SLOT(filter(QString)));