Git: Do not refresh branch view when hidden

Change-Id: Ia2e327b6396657255f9b40b792d794a647fc5745
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/plugins/git/branchview.h

@@ -65,6 +65,9 @@ public:
     QAction *m_includeOldEntriesAction = nullptr;
     QAction *m_includeTagsAction = nullptr;
 
+protected:
+    void showEvent(QShowEvent *) override;
+
 private:
     void refreshCurrentRepository();
     void resizeColumns();