QmlProfiler: Clean up type selection in statistics model

The statistics have one extra valid event type: "Main Program". This
should not be mapped to typeId -1, as -1 is the invalid typeId. Map it
instead to std::numeric_limits<int>::max() and remove all the hacks
around it.

Additionally, optimize the selection algorithm for the statistics main
view: We don't need to iterate all types to select one. We can rather
use the fact that the row numbers in the source model match the type
indices (except for the two special ones).

Change-Id: I7c4dc4f84fd167f9a21c418466ad2bfce56e441f
Reviewed-by: Tobias Hunger <tobias.hunger@qt.io>

src/plugins/qmlprofiler/qmlprofilerstatisticsview.h

@@ -81,13 +81,11 @@ public:
     void copyTableToClipboard() const;
     void copyRowToClipboard() const;
 
-    int selectedTypeId() const;
-
     void setShowExtendedStatistics(bool);
     bool showExtendedStatistics() const;
 
-    void jumpToItem(const QModelIndex &index);
-    void selectType(int typeIndex);
+    void displayTypeIndex(int typeIndex);
+    void jumpToItem(int typeIndex);
 
     void restrictToFeatures(quint64 features);
     bool isRestrictedToRange() const;
@@ -97,10 +95,10 @@ public:
 
 signals:
     void gotoSourceLocation(const QString &fileName, int lineNumber, int columnNumber);
-    void typeSelected(int typeIndex);
+    void typeClicked(int typeIndex);
+    void propagateTypeIndex(int typeIndex);
 
 private:
-    void selectItem(const QModelIndex &index);
     QString textForItem(const QModelIndex &index) const;
 
     std::unique_ptr<QmlProfilerStatisticsModel> m_model;
@@ -115,11 +113,10 @@ public:
     ~QmlProfilerStatisticsRelativesView();
 
     void displayType(int typeIndex);
-    void jumpToItem(const QModelIndex &);
+    void jumpToItem(int typeIndex);
 
 signals:
     void typeClicked(int typeIndex);
-    void gotoSourceLocation(const QString &fileName, int lineNumber, int columnNumber);
 
 private: