Implement best size calculation for report mode wxListCtrl.

Use the column labels to determine the minimal width required by the control
to show them all in full.

Also declare all image list and column-related wxListCtrl methods in
wxListCtrlBase now as we need some of them in DoGetBestClientSize()
implementation.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@70282 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/osx/listctrl.h

@@ -252,12 +252,6 @@ class WXDLLIMPEXP_CORE wxListCtrl: public wxListCtrlBase
   // Insert an image/string item
   long InsertItem(long index, const wxString& label, int imageIndex);
 
-  // For list view mode (only), inserts a column.
-  long InsertColumn(long col, wxListItem& info);
-
-  long InsertColumn(long col, const wxString& heading, int format = wxLIST_FORMAT_LEFT,
-    int width = -1);
-
   // Scrolls the list control. If in icon, small icon or report view mode,
   // x specifies the number of pixels to scroll. If in list view mode, x
   // specifies the number of columns to scroll.
@@ -371,14 +365,14 @@ class WXDLLIMPEXP_CORE wxListCtrl: public wxListCtrlBase
   GetClassDefaultAttributes(wxWindowVariant variant = wxWINDOW_VARIANT_NORMAL);
 
 protected:
+  // Implement base class pure virtual methods.
+  long DoInsertColumn(long col, const wxListItem& info);
 
   // protected overrides needed for pimpl approach
   virtual void DoSetSize(int x, int y,
                          int width, int height,
                          int sizeFlags = wxSIZE_AUTO);
 
-  virtual wxSize DoGetBestSize() const;
-
   long               m_current;
   wxListCtrlTextCtrlWrapper *m_textctrlWrapper;
   wxListCtrlRenameTimer *m_renameTimer;