Merge problem with new vertex paint feature for grease pencil

[ReinerBforartists]

The newest merge brought us new grease pencil features. And a big problem. A so far unresolveable bug. Vital code looks equal everywhere. I have grepped all the terms. I have compared all the code with Meld a few times. Not to catch. In Blender it works, in Bforartists not.

I have created a branch for just this bug now. It is located here: https://github.com/Bforartists/Bforartists/tree/gpencilvertpaintprob

We need to resolve this bug before we can go on and merge the newest changes into Bforartists master. I don't want to ship the new official version with a known bug of this scope.

How to reproduce. Create a grease pencil object. Switch to the new vertex paint mode. Open the console and watch the error message.

[ReinerBforartists]

Updated some addons. And i have compared the source code between Blender and Bforartists again. Catched a few inconsistenices like a missing include. But the baddie here was not part of it.

[ReinerBforartists]

Continuing to eliminate all unexpected differences that i stumble across. Found another difference here in the preferences. Grease pencil multisampling ...

[ReinerBforartists]

Wrong alert. Started the wrong bfa version. But found nevertheless a difference in space_userpref.py file ...

[ReinerBforartists]

Most probably the trouble commit: SHA-1: 29f3af9

• GPencil: Refactor of Draw Engine, Vertex Paint and all internal functions

This commit is a full refactor of the grease pencil modules including Draw Engine, Modifiers, VFX, depsgraph update, improvements in operators and conversion of Sculpt and Weight paint tools to real brushes.

Also, a huge code cleanup has been done at all levels.

Thanks to @Fclem for his work and yo @Pepeland and @mendio for the testing and help in the development.

Differential Revision: https://developer.blender.org/D6293

[ReinerBforartists]

Still at evaluating.

We have a missing brush browser content before the stylus pressure strength buttons already. Maybe that's a hot track.

[ReinerBforartists]

Same cause, same dead end. Not to catch.

Starting from scratch now, adding our features back to Blender. This can take a few weeks ...

[ReinerBforartists]

First step. The error must reside in release folder. This was the first folder that i have thrown in now. And the error is immediately back. So back to compare the code base.

[ReinerBforartists]

Nailed it. It's the startup.blend. They have most probably stored something in the file that is still missing in our startup.blend file. And this leads to our none error then.

Seems that we have to recreate all of our layouts now. But at least we have the baddie.

[ReinerBforartists]

Fixed in gpencilvertpaintprob branch

Now let's merge it into the syncblendermaster branch, and from there into master ...