Blender 2.80 - Weight Paint Mode and Face Selection Masking

Hi, this is my first time posting in devtalk.
For some strange reason I can log in here but not at .

Weight Painting in Blender 2.80 still has a few quirks.
One quirk is the Face Selection Masking. I believe a bug report has been made, but I would like to show a workaround for those who still wish to use it: