There is a mouse Leave event after all.. Fix the focus glitches properly

sleepyhead/Graphs/gGraphView.cpp

@@ -1074,6 +1074,13 @@ void gGraphView::paintGL()
     }
 }
 
+void gGraphView::leaveEvent(QEvent * event)
+{
+    Q_UNUSED(event);
+    releaseKeyboard();
+}
+
+
 // For manual scrolling
 void gGraphView::setOffsetY(int offsetY)
 {

sleepyhead/Graphs/gGraphView.h

@@ -202,7 +202,6 @@ class gGraphView
     virtual ~gGraphView();
     virtual void closeEvent(QCloseEvent * event);
 
-
     //! \brief Add gGraph g to this gGraphView, in the requested graph-linkage group
     void addGraph(gGraph *g, short group = 0);
 
@@ -387,6 +386,8 @@ class gGraphView
 
   protected:
 
+    virtual void leaveEvent (QEvent * event);
+
     //! \brief The heart of the drawing code
 #ifdef BROKEN_OPENGL_BUILD
     virtual void paintEvent(QPaintEvent *);

sleepyhead/preferencesdialog.cpp

@@ -45,12 +45,6 @@ MaskProfile masks[] = {
 };
 const int num_masks = sizeof(masks) / sizeof(MaskProfile);
 
-void PreferencesDialog::showEvent(QShowEvent * event)
-{
-    mainwin->getDaily()->graphView()->releaseKeyboard();
-    mainwin->getOverview()->graphView()->releaseKeyboard();
-}
-
 PreferencesDialog::PreferencesDialog(QWidget *parent, Profile *_profile) :
     QDialog(parent),
     ui(new Ui::PreferencesDialog),

sleepyhead/preferencesdialog.h

@@ -68,9 +68,6 @@ class PreferencesDialog : public QDialog
     //! \brief Updates the date text of the last time updates where checked
     void RefreshLastChecked();
 
-  protected:
-    virtual void showEvent(QShowEvent * event);
-
   private slots:
     void on_eventTable_doubleClicked(const QModelIndex &index);
     void on_combineSlider_valueChanged(int value);