Fix text text changed events sending in OS X combo box and text control.

Don't duplicate needlessly wxTextEntry functionality in wxTextCtrl.

Don't clear the combobox text entry part twice in wxComboBox::DoClear(), it is
supposed to only clear the item container contents as the base class Clear()
already calls wxTextEntry::Clear().

Do send text updated events from wxTextEntry itself as it applies to
wxComboBox just as well as to wxTextCtrl.

The unit tests now pass under wxOSX/Cocoa, not breaking them again would be
appreciated.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@63881 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/osx/textentry_osx.cpp

@@ -148,6 +148,8 @@ wxTextPos wxTextEntry::GetLastPosition() const
 void wxTextEntry::Remove(long from, long to)
 {
     GetTextPeer()->Remove( from , to ) ;
+
+    SendTextUpdatedEventIfAllowed();
 }
 
 void wxTextEntry::SetSelection(long from, long to)
@@ -158,11 +160,15 @@ void wxTextEntry::SetSelection(long from, long to)
 void wxTextEntry::WriteText(const wxString& str)
 {
     GetTextPeer()->WriteText( str ) ;
+
+    SendTextUpdatedEventIfAllowed();
 }
 
 void wxTextEntry::Clear()
 {
     GetTextPeer()->Clear() ;
+
+    SendTextUpdatedEventIfAllowed();
 }
 
 bool wxTextEntry::IsEditable() const