$this->WP_Widget Constructor in WP 4.3

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Posted: 9/9/2015
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Hello to all, I have updated a WP installation to WP 4.3. That causes the problem, that it is no longer possible to upload media.
Debugging shows an error of deprecated constructor method.
I found a solution here http://docs.layerswp.com/doc/notice-the-called-constructor-method-for-wp_widget-is-deprecated-since-version-4-3-0-use-__construct/ but don't know, how to change $this->WP_Widget in themes.

Artisteer version 4.3.0. ... are there any updates for WP 4.3?

Posted: 12/17/2015
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found a solution that worked for me: