search results are invisible, when PDF viewer is open

[jnweiger]

Seen in 10.13.1 (and probably before)

• In Classic files view, click open a PDF (e.g. in the folder 'Learn more about ownCloud')
• PDF Viewer opens

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• The search field in the top right title ar does not find the word 'Data' in the text. BAD
• Close the PDF viewer with the (x) in the top righthand corner.
• Search results appear. Okayish

Expected behaviour:

• a) when the pdf viewer is open, the search works in this document or
• b) when the search is executed, the PDF viewer closes and results are visible. (This is how the new Web UI behaves)