Description:
In Excel 2010 the default automatic line chart markers are different in shape and color. When opening and saving the example file in current LO master the shapes are all converted to a square.
In Excel 2013 the default markers are different only in color and the shape is a dot, which is retained on LO export.


Steps to Reproduce:
1.	Create a line chart in Excel 2010 with many data rows
2.	Notice they get the Automatic marker setting which gets a different shape
3.	Open and save the file in Calc


Actual Results:
On saving all previously different shapes become a square. Also Excel indicates this is not “automatic” type but built-in, i.e. customly set.
In case of the Excel 2013 file the type changes to built-in too. However since there was no difference between shapes to begin with, the built-in dot shape is not visually different from the original automatic type dot shape.


Expected Results:
The “automatic” type setting is retained.


Reproducible: Always


User Profile Reset: No



Additional Info:
LibreOffice details:
Version: 6.4.0.0.alpha0+ (x86)
Build ID: 4808ae1c73597726c89936f5b9cb3f11c9a4a7bf
CPU threads: 4; OS: Windows 6.3; UI render: GL; VCL: win; 
TinderBox: Win-x86@42, Branch:master, Time: 2019-06-24_23:50:55
Locale: hu-HU (hu_HU); UI-Language: en-US
Calc: CL