Ignore non-existant string selection in wxComboBox::SetValue() in read-only mode, as per the very exact docs, fixes #12329: wxComboBox can set non-existing string in read only mode

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@65324 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/gtk/combobox.cpp

@@ -276,6 +276,14 @@ wxComboBox::GetClassDefaultAttributes(wxWindowVariant WXUNUSED(variant))
     return GetDefaultAttributesFromGTKWidget(gtk_combo_box_entry_new, true);
 }
 
+void wxComboBox::SetValue(const wxString& value)
+{
+    if ( HasFlag(wxCB_READONLY) )
+        SetStringSelection(value);
+    else
+        wxTextEntry::SetValue(value);
+}
+
 // ----------------------------------------------------------------------------
 // standard event handling
 // ----------------------------------------------------------------------------