ID 405894 - Basic Brush preset 'one' creates a dark matte ring when painted within itself

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Problem summary
Basic Brush preset 'one' creates a dark matte ring when painted within itself in Mari 4.5v2.

This issue only occurs in Mari 4.5v2 and has only been seen with the 'one' basic brush preset.

Customer reported version
4.5v2

Customer reported platform
Unknown.

Steps to reproduce

1) Open a new Mari 4.5v2 session

2) Open/Create a new example head project

3) Add a new Paint layer

4) With the Paint layer selected, open the 'Shelf' palette

5) Within the 'Basic Brushes' tab select the 'one' brush

6) Alter the radius to 150, then draw onto the head and rotate to bake the stroke

7) Once baked, alter the radius value to 50 and draw another stroke within the previously baked area.
Result: The additional stroke on the Paint layer will create a dark matte ring.



Expected behaviour
When using the 'one' brush, this process should not be creating a dark matte ring.

Actual behaviour
A dark matte ring is created when using the 'one' preset basic brush

Workaround
Unknown. Avoid using the 'one' preset brush in Mari 4.5v2

Reproduced by support
This bug has been reproduced in:
Mari 4.5v2 - Windows 7 - CentOS 7

Unable to reproduce bug in:
Mari 4.5v1 - Windows 7 - CentOS 7

Earliest version tested
Mari 4.5v1
- This issue doesn't appear in this version and has regressed

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