Description:
Setting the background surface of the default outline area "Gliederungsbereich" in the master view will not be seen in the normal view

Steps to Reproduce:
Just open a new presentation and skip using a predefined master (with ESC).
Activate the master slide view now.
Select the outline area and define a colour for the background surface.
=> You will see the whole square filled with this colour, as expected
Now activate the normal view


Actual Results:
You will see a white background only
Even in presentation mode, there is no colour rendered

Expected Results:
The background should be rendered with my selected colour


Reproducible: Always


User Profile Reset: No


OpenGL enabled: Yes

Additional Info:
Hints: 
- Switching back to master view will show You the colour again
- Doing the same actions with the title area works flawless


[Information automatically included from LibreOffice]
Locale: de
Module: PresentationDocument
[Information guessed from browser]
OS: Linux (All)
OS is 64bit: yes

About info:
Version: 6.1.3.2
Build-ID: 10(Build:2)
CPU-Threads: 8; BS: Linux 4.12; UI-Render: Standard; VCL: gtk3_kde5; 
Gebietsschema: de-DE (de_DE.UTF-8); Calc: group threaded

OpenGL settings:
OpenGL vendor string: X.Org
OpenGL renderer string: AMD PITCAIRN (DRM 2.50.0 / 4.12.14-lp150.12.45-default, LLVM 5.0.1)
OpenGL core profile version string: 4.5 (Core Profile) Mesa 18.0.2
OpenGL core profile shading language version string: 4.50
OpenGL core profile context flags: (none)
OpenGL core profile profile mask: core profile
OpenGL core profile extensions:
OpenGL version string: 3.0 Mesa 18.0.2
OpenGL shading language version string: 1.30
OpenGL context flags: (none)
OpenGL extensions:
OpenGL ES profile version string: OpenGL ES 3.1 Mesa 18.0.2
OpenGL ES profile shading language version string: OpenGL ES GLSL ES 3.10