Allow changing alignment styles after wxTextCtrl creation (wxOSX)

Update NSTextView/NSTextField alignment mode when wxTextCtrl alignment styles are changed with SetWindowStyleFlag().

Closes #17952.

include/wx/osx/cocoa/private/textimpl.h

@@ -69,6 +69,7 @@ public :
     virtual void WriteText(const wxString& str) wxOVERRIDE ;
     virtual bool HasOwnContextMenu() const wxOVERRIDE { return true; }
     virtual bool SetHint(const wxString& hint) wxOVERRIDE;
+    virtual void SetJustification() wxOVERRIDE;
 
     virtual void controlAction(WXWidget slf, void* _cmd, void *sender) wxOVERRIDE;
     virtual bool becomeFirstResponder(WXWidget slf, void *_cmd) wxOVERRIDE;
@@ -125,6 +126,7 @@ public:
     virtual void EnableAutomaticDashSubstitution(bool enable) wxOVERRIDE;
 
     virtual wxSize GetBestSize() const wxOVERRIDE;
+    virtual void SetJustification() wxOVERRIDE;
 
     virtual void controlTextDidChange() wxOVERRIDE;
 

include/wx/osx/core/private.h

@@ -695,6 +695,7 @@ public :
     virtual wxSize GetBestSize() const { return wxDefaultSize; }
 
     virtual bool SetHint(const wxString& WXUNUSED(hint)) { return false; }
+    virtual void SetJustification();
 private:
     wxTextEntry * const m_entry;
 

include/wx/osx/textctrl.h

@@ -100,6 +100,7 @@ public:
     virtual void Command(wxCommandEvent& event) wxOVERRIDE;
 
     virtual bool AcceptsFocus() const wxOVERRIDE;
+    virtual void SetWindowStyleFlag(long style) wxOVERRIDE;
 
     // callbacks
     void OnDropFiles(wxDropFilesEvent& event);