Description:
Using the LibreOffice Calc on MacOS Sierra 10.12.3
When the new documents are opened, the document tab at the top will cover up the topmost section of the document viewport usually ocupied by the toolbar
Attaching the screenshots from two versions: 5.2.5.1 and 5.4.0.0.alpha0+
in both cases showing a LibreOffice window with only 1 Calc document open and another instance with two Calc documents.
The same issue affects the Presentation, Draw, Settings and other windows
The only app unaffected appears to be the Writer




Steps to Reproduce:
On MacOS Sierra, open more than one document of Calc, Presentation, Draw or the settings window

Actual Results:  
the document tab is covering up the topmost portion of the document viewport (i.e. the viewport isn't resized)

Expected Results:
the viewport should be adjusted so that the topmost edge is locate under the document tabs


Reproducible: Always

User Profile Reset: No

Additional Info:


User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_3) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/56.0.2924.76 Safari/537.36