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Grease Pencil tool leaves blobs at the end of strokes
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System Information
Operating system: Darwin-18.5.0-x86_64-i386-64bit 64 Bits
Graphics card: AMD Radeon Pro 555 OpenGL Engine ATI Technologies Inc. 4.1 ATI-2.8.38

Blender Version
Broken: version: 2.80 (sub 57), branch: blender2.7, commit date: 2019-04-19 17:39, hash: rBbc8b884e5325
Worked: (optional)

Short description of error

Grease Pencil continually adds little blobs of ink to the ends of my strokes and no amount of changing settings seems to get rid of them.
I'm using Astropad for iOS/MacOS as a tablet and don't have this issue in any other software I'm using it to draw with. I've tried changing all the brush settings to get rid of the problem but nothing works.

Exact steps for others to reproduce the error

Open a new blender file
Create a Grease Pencil Object
Draw Mode
Try drawing a Grease Pencil frame with Astropad

Event Timeline

@Brecht Van Lommel (brecht) I think we already had a report for issues like this? I can't find it now though...

I'm guessing that there is something funny going on with the pressure detection on lift. But I do not have the HW to reproduce this myself.

I don't have the hardware to test this either. @Sergey Sharybin (sergey) has a recent Mac laptop that might be able to reproduce T62565.