[Kde-bindings] strange behavior with qobject_cast

[Stefano Crocco]

The qobject_cast method, while allowing to use the DocumentExtension 
interfaces of KTextEditor (for example KTextEditor::AnnotationInterface) seems 
to interact in a strange way with the object it's called upon. In particular, 
I found that methods ending in ? seems to disappear after a call to 
qobject_cast. Lowercased methods, instead, remain. Here's a little program 
which produces this behavior:

require 'korundum4'
require 'ktexteditor'

data = KDE::AboutData.new "kruby", "", KDE::ki18n("KRuby"), "0.0.1"
KDE::CmdLineArgs.init [], data

app = KDE::Application.new
doc = KTextEditor::EditorChooser.editor('katepart').create_document nil
puts "Empty (before): #{doc.empty?}"
puts "Modified (before): #{doc.modified?}"
am = doc.qobject_cast(KTextEditor::AnnotationInterface).annotation_model
puts "Empty (after): #{doc.empty?}"
puts "Modified (after): #{doc.modified?}"

The error message is:

Empty (before): true
Modified (before): false
./prova.rb:14:in `method_missing': undefined method `empty?' for 
#<KTextEditor::Document:0xb582c700 objectName=""> (NoMethodError)
        from ./prova.rb:14

Replacing the calls to empty? and modified? with calls to is_empty and 
is_modified shows that the latter still work.

Stefano