Active paint slot image does not update in some cases

[Al-Hydra]

I don't know why the default mode is material but for whatever reason this makes it so ucupaint can't select the correct texture, especially when it's a texture created with ucupaint itself, so I either have to set the texture manually or add another material to trigger the "is_multiple_mats" condition.

so here's what I propose, either change the default method to "IMAGE" or add an option to change the default method

[ucupumar]

Ucupaint used to use 'Image' method for changing active image but the problem with that is you can't easily select images outside ucupaint node. The multiple material still use 'image' method since if not, painting a texture can overlap between multiple textures at the same time.

I have never had any problems with the 'material' method before. Do you use any other addons that manipulate the active image?

[Al-Hydra]

I don't have any addon that manipulates the active image but I do have a specific shader setup that has tone mapping textures inside other node groups, which I think is the root of the problem.

[ucupumar]

Can you give some example blend file so I can test the issue?

[Al-Hydra]

Example.zip

[ucupumar]

I just commit a fix for this issue, please use the master branch to test it