The Problem

I want to paste my tunnel walls and replace stone,granite,dirt,grass_block but preserve ores and other unexpected blocks.

A Solution

Like #957 (source mask), allow to specify a destination mask of which blocks are acceptable to replace.

Alternatives

No response

Anything Else?

Thanks for WE! It's very neat.

This is how masks work, nothing needs to be added here

I just checked the manual before posting and I could only find an option for source mask, not destination mask.

Oh, did you mean I have to set //gmask before each paste, and reset it after? That's a bit more cumbersome but yeah that works indeed.