Description:
in the program Draw, when I choose a page background from the HATCH dialogue, it lasts only while the file is open. after I close it, it's not there when I reopen the file, but there are only some very annoying tightly drawn blue lines. I'm not sure if it's a bug or something I'm doing wrong, but I'm sure it's not the correct behaviour. 

Steps to Reproduce:
1.click on page/properties/background/hatch
2.choose the first pattern "Black 0 degrees"
3.change Spacing to 0.50 cm
4.choose Line colour to grey-25
5.all other settings I leave as they are
6.click OK
7.save the file
8.close the file
9.re-open the file

Actual Results:
the background is set to a thin-spaced blue background pattern

Expected Results:
the background pattern should be the one I saved the file with


Reproducible: Always


User Profile Reset: No


OpenGL enabled: Yes

Additional Info:
Version: 7.0.0.3
Build ID: 8061b3e9204bef6b321a21033174034a5e2ea88e
CPU threads: 4; OS: Linux 4.15; UI render: default; VCL: gtk3
Locale: en-GB (en_GB.UTF-8); UI: en-GB
Calc: threaded
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I have screenshots of the expected and the actual results if necessary