Guard shell `run_all` run multiple times

[louim]

Hey!

I have a simple guard-shell command to run a rake task when file change:

guard :shell, first_match: true do
  watch(%r{^app/graphql/(mutations.*|types.*|fx_api_schema\.rb)$}) do |m|
    #following line is for debugging purposes
    Guard::UI.info "The original match is: #{m.inspect}"
    `bin/rake graphql:schema:idl`
  end
end

It works ok when saving one of the files matching, but when I run all with guard, it tries to run that task once for each files that matches (in my case, around 75 times). I even tried the block above with only the inspect line to see if that was related to the task itself and it still printed all matches.

When I try the above block in another guard plugin block for example rubocop or rspec, I get no printout at all on the all run.

I have seen #17, but adding the first_match doesn't help (as expected, because it's only one watch block).