[Kde-bindings] QtRuby's is_a? / kind_of? behavior

[airh2002]

QtRuby's is_a? / kind_of? behavior doesn't correspond with QtRuby's
inheritance.

I attach test ruby script "test_fot_inheritance.rb" to confirm results
of Qt::Base.ancestors, instance_of?, and kind_of? methods.

In this script, cases of normal Ruby object behave as expected,
but cases of QtRuby object(Qt::Label) don't.
Qt::Base.ancestors and instance_of? are behaving correctly,
but kind_of? is not because of Qt::Base class don't override is_a? or
kind_of?

So I add is_a? / kind_of? method definition on Qt::Base class in qtruby4.rb.
I also attach its diff file "qtruby4_rb.diff".

----------------
Youhei Kondou
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