Created attachment 148921 [details]
Example file from Word 2013

Microsoft Word stores the table level background fill color setting in OOXML (DOCX) files, but doesn't actually use it. This causes problems, when there is a fill color set on the table level, but the fill color of the individual cells is set to auto.

This bug can only be reproduced by using Microsoft Word.

Steps to reproduce:
    1. Create a new text document in Microsoft Word.
    2. Insert a 1 column wide, 3 row height table.
    3. Select the whole table and set the background fill color for the whole table to black.
    4. select the second and third rows and change the background fill to auto.
    5. Delete the first row of the table.
    6. Save the file as DOCX.
    7. Open the file both in LibreOffice Writer and Microsoft Word.

Actual results:
The background in LibreOffice Writer turns black because the table level setting is interpreted.

Expected results:
LibreOffice Writer should ignore the table level background color fill setting and just use the per cell level settings just like Microsoft Word does.

Additional details:
After poking around on the user interface and getting an understanding what actually happens on the XML level I determined, that Microsoft Word doesn't actually have a table level background fill color option despite what it tells:

1. The user can set a table level fill color but this just actually turns all individual cell setting at once. This is evident if you change individual cells fill color after changing the “table” fill color: When you check the “table” level setting you will actually see the background color of the selected cell and not what was formerly set as “table” level setting.

2. Changing the fill color of an individual cell to “auto” turns it into color of the background behind the table, and not the color of the table, because the table doesn't actually have a color, only the cells have. This behavior is the complete opposite of what LibreOffice Writer does, which actually has a real table level background fill property.

3. Despite all of the above, if a table level fill color was set when the document was edited it is still stored in the XML file somewhere between <w:tbl> (table) and the first <w:tc> (table cell) tag (so, as a table level setting) in a tag like this: <w:shd w:val="clear" w:color="auto" w:fill="000000" w:themeFill="text1"/>. This setting is kept in the file even if every single cell has been altered or deleted after the table level fill color was set – and despite that Microsoft Word doesn't even have a “real” table level fill color setting. The best thing to do is probably ignore this altogether when importing a DOCX file.

Version: 6.3.0.0.alpha0+
Build ID: fcc5fc76c33de566cb2d02be541dcbde29d1eb8a
CPU threads: 4; OS: Windows 6.3; UI render: GL; VCL: win; 
Locale: hu-HU (hu_HU); UI-Language: en-US
Calc: threaded