Git: Double click on branch shows log

...instead of allowing to rename inline. Renaming can still be done with
the context menu.

Inspecting the log is a more common operation.

Change-Id: Idb3fb8fe01b6a5ae57a2eba09b27a36f677e566a
Reviewed-by: Orgad Shaneh <orgads@gmail.com>
Reviewed-by: André Hartmann <aha_1980@gmx.de>

src/plugins/git/branchview.h

@@ -31,6 +31,7 @@
 #include <QWidget>
 
 QT_BEGIN_NAMESPACE
+class QModelIndex;
 class QPoint;
 class QToolButton;
 class QTreeView;
@@ -79,6 +80,7 @@ private:
     bool merge(bool allowFastForward);
     void rebase();
     bool cherryPick();
+    void log(const QModelIndex &idx);
 
     QToolButton *m_addButton = nullptr;
     QToolButton *m_refreshButton = nullptr;