System Information
Operating system: Windows-10-10.0.17763 64 Bits
Graphics card: Radeon RX Vega ATI Technologies Inc. 4.5.13558 Core Profile Context 26.20.11015.5009

Blender Version
Broken: version: 2.80 (sub 74), branch: master, commit date: 2019-07-02 11:35, hash: rBef750790d261
Worked: (optional)

Short description of error
Selecting image texture nodes in the shader editor will unsync texture slots when texture painting

Exact steps for others to reproduce the error
This 2min 30 sec video shows the problem. I am not sure if it is a bug but it is confusing.

https://1drv.ms/v/s!Au_hU1Dki2NCipIGzQ01HaEdTbzGyg?e=dqHtRw

I would also like to suggest new default settings for the texture paint workspace. In the overlay menu set texture paint opacity to 0. Then in viewport setting for solid mode, set the lighting to flat and colour to texture.

This way the user can switch between viewing a single image and the full material by switching between solid and lookdev mode and while in solid viewport shading the user can switch texture slots to view different images in the 3D view.

These settings should make more sense for a new user.