MIF Filter: inner anchored frames content is not extracted

In the case when one frame is anchored into another one, its content is not extracted. E.g.

The actual extraction is:

<body>
<trans-unit id="1" xml:space="preserve">
<source xml:lang="en">Paragraph 0.</source>
<target xml:lang="fr">Paragraph 0.</target>
</trans-unit>
<trans-unit id="2" xml:space="preserve">
<source xml:lang="en">In anchored frame 1.</source>
<target xml:lang="fr">In anchored frame 1.</target>
</trans-unit>
</body>

An expected extraction may be:

<body>
<trans-unit id="1" xml:space="preserve">
<source xml:lang="en">Paragraph 0.</source>
<target xml:lang="fr">Paragraph 0.</target>
</trans-unit>
<trans-unit id="2" xml:space="preserve">
<source xml:lang="en">In anchored frame 1.</source>
<target xml:lang="fr">In anchored frame 1.</target>
</trans-unit>
<trans-unit id="3" xml:space="preserve">
<source xml:lang="en">In anchored frame 2.</source>
<target xml:lang="fr">In anchored frame 2.</target>
</trans-unit>
<trans-unit id="4" xml:space="preserve">
<source xml:lang="en">In anchored frame 3.</source>
<target xml:lang="fr">In anchored frame 3.</target>
</trans-unit>
<trans-unit id="5" xml:space="preserve">
<source xml:lang="en">In anchored frame 4.</source>
<target xml:lang="fr">In anchored frame 4.</target>
</trans-unit>
<trans-unit id="6" xml:space="preserve">
<source xml:lang="en">In anchored frame 5.</source>
<target xml:lang="fr">In anchored frame 5.</target>
</trans-unit>
<trans-unit id="7" xml:space="preserve">
<source xml:lang="en">In anchored frame 6.</source>
<target xml:lang="fr">In anchored frame 6.</target>
</trans-unit>
</body>

Please be aware, the text lines extraction will be covered in a separate issue.

For more details please refer to the attached file.

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