fix strict with set_space_around_op

[lorenzwalthert]

Reference: mlr-org/mlr#2498 (comment).

Fix was needed because a function gained a strict argument. Also, note that now, alignment is detected (function calls only). For example:

library(styler)
style_text(
  "call(
    a  = 1,   f(x),
    b  = 3, fff(x)
  )",
  style = mlr_style
)
#> call(
#>   a  = 1,   f(x),
#>   b  = 3, fff(x)
#> )

^{Created on 2019-08-22 by the reprex package (v0.3.0)}

See https://styler.r-lib.org/articles/detect-alignment.html for details on when styler detects things as aligned and the discussion for developing alignment detection in r-lib#258.

[pat-s]

Thanks! 🚀