- The /d mask command will now accept a list of block types. Additionally, the "-invert" flag was added to make the mask select everything except the list of material types entered.
Example: /d mask stone,grass_block will select only stone or grass in the selection
/d mask stone grass_block -invert will select all block displays in the selection that aren't stone or grass. (You can use either commas or spaces for the list)

- You can now simply type /d mask to disable the mask, no need for the "-none" flag.