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nitpicker: fix gcc build error
An early version of nitpicker used a pointer as 'owner' with the null pointer representing nitpicker's built-in views, which are nowadays represented by 'Main::_global_view_ower'. The null-pointer check is a left-over from the earlier days. Fixes #4847
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@ -114,7 +114,8 @@ void Nitpicker::View::draw(Canvas_base &canvas, Font const &font, Focus const &f
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* If the clipping area shrinked to zero, we do not process drawing
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* operations.
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*/
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if (!canvas.clip().valid() || !&_owner) return;
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if (!canvas.clip().valid())
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return;
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/* allow alpha blending only if the raw client content is enabled */
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bool allow_alpha = _owner.content_client();
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