PyCQA / astroid / 1711

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<a href="https://github.com/PyCQA/astroid/commit/<a class=hub.com/PyCQA/astroid/commit/<a class="double-link" href="https://git"><a class=hub.com/PyCQA/astroid/commit/<a class="double-link" href="https://git"><a class=hub.com/PyCQA/astroid/commit/<a class="double-link" href="https://git"><a class=hub.com/PyCQA/astroid/commit/ab9d147d71c3dff39972b7d2173aa66a616ff5b7">ab9d147d7<a href="https://github.com/PyCQA/astroid/commit/ab9d147d71c3dff39972b7d2173aa66a616ff5b7">&quot;&gt;&amp;lt;a href=&amp;quot;https://github.com/PyCQA/astroid/commit/&lt;/a&gt;&lt;a class=&quot;double-link&quot; href=&quot;https://github.com/PyCQA/astroid/commit/&amp;lt;a class=&amp;quot;double-link&amp;quot; href=&amp;quot;https://git&quot;&gt;&amp;lt;a class=&lt;/a&gt;hub.com/PyCQA/astroid/commit/ab9d147d71c3dff39972b7d2173aa66a616ff5b7&quot;&gt;ab9d147d7&lt;/a&gt;&lt;a href=&quot;https://github.com/PyCQA/astroid/commit/ab9d147d71c3dff39972b7d2173aa66a616ff5b7&quot;&gt;&amp;lt;a href=&amp;quot;https://github.com/PyCQA/astroid/commit/ab9d147d71c3dff39972b7d2173aa66a616ff5b7&amp;quot;&amp;gt;&amp;amp;quot;&amp;amp;gt;Allow slots added dynamically to a class</a> to still be inferred

In &lt;/a&gt;&lt;a class=&quot;double-link&quot; href=&quot;https://github.com/PyCQA/astroid/commit/&lt;a class=&quot;double-link&quot; href=&quot;https://github.com/PyCQA/astroid/commit/<a class="double-link" href="https://github.com/PyCQA/astroid/commit/2aa27e9aed6ffcba4a61655e291e852ecd001549">2aa27e9ae</a>&quot;&gt;2aa27e9ae&lt;/a&gt;&quot;&gt;2aa27e9ae&lt;/a&gt;&lt;a href=&quot;https://github.com/PyCQA/astroid/commit/ab9d147d71c3dff39972b7d2173aa66a616ff5b7&quot;&gt; `ClassDef.igetattr`
was modified to only grab the first item from the result of `getattr`,
in order to avoid looking up attributes in the ancestors path when
inferring attributes for a given class. This had the side effect
that we&amp;#39;d omit attribute definitions happening in the same scope,
such as augmented assignments, which in turn might have affected
other capabilities, such as slots inference.

This commit changes the approach a bit and keeps all attributes
as long as all of them</a> are from the same class (be it current
or an ancestor)

Close PyCQA/pylint#2334

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