Silence visibility warning, state mutability can be restricted to pure

Question

Suppose I have an interface:

pragma solidity 0.7.6;
interface Foo {
  function foo() public view returns(bool);
}

And a simplistic implementation like a mock:

contract Bar is Foo {
function foo() public view returns(bool} {
    this; // silence state mutability warning
    return true;
  }
}

This part:

this;

... sort of works. See here: Function overriding versus Solidity Compiler Warning: Function state mutability can be restricted to pure

It seems clean enough with truffle compile and hardhat compile but solidity-coverage still complains about it:

state mutability can be restricted to pure

Sure, but this is a false positive. We don't want to change any code. The perfectionist in me doesn't want to see alarming warnings where no issue exists.

Is there a better way to silence the warning?

Thanks :-)