Linux Mint GTX 660ti, Mac OS Sierra ATI Radeon HD 5770 1024 MB
Broken: (example: 2.8 2018-02-07 23:41 hash 42c99ee55f51)
Textures used as brush or brush mask interfere with application of paint to different slots, main issue is Texture Panel in Properties Panel for Brush and Brush Mask doesn't show any of the sub panels with all the settings for the procedural textures so as to set them up to use.
Exact steps for others to reproduce the error
Open the file from https://drive.google.com/file/d/1lVdkhkQphI2ZCspGhP-C3G59ZgB9pe9V/view?usp=sharing
Set the Display to full shading and then select a texture slot to paint to, using the embedded texture brush mask, and look for the panels to adjust the brush mask texture in the Properties editor. You won't find them, and even if you adopt another texture type from the drop down, you won't see anything to adjust with.
Performance issues compared with default TexDraw brush to color on Color_paint_head, on Linux mint I had issues with getting color to show up, even making sure to delete and preexisting procedural textures in the brush settings. On Mac, got the paint to work but very very slow performance on this 2010 MacPro. Still no texture brush panels showing in the properties editor.
Exchange with Dalai Felinto prompted me to report it, though I understand this may be a design change or just ignorance on my part - I paint, so I look for this to work like 2.79 paint system.