Less :extend() unwanted space

[andreaswilli]

Prettier 2.0.3
Playground link

--parser less

Input:

// works as expected
.class {
  &:extend(.some-class .some-other-class .some-very-loooooooooooooong-class all);
}

// formatting once again adds an unwanted space after colon
.class {
  &:extend(
    .some-class .some-other-class .some-very-loooooooooooooong-class all
  );
}

Output:

// works as expected
.class {
  &:extend(
    .some-class .some-other-class .some-very-loooooooooooooong-class all
  );
}

// formatting once again adds an unwanted space after colon
.class {
  &: extend(
    .some-class .some-other-class .some-very-loooooooooooooong-class all
  );
}

The additional space after the color causes this error: Unrecognised input in file styles.less similar to #1967.

Expected behavior:

// works as expected
.class {
  &:extend(
    .some-class .some-other-class .some-very-loooooooooooooong-class all
  );
}

// no additional space after colon
.class {
  &:extend(
    .some-class .some-other-class .some-very-loooooooooooooong-class all
  );
}

[alexander-akait]

/cc @thorn0 Looks regression again

[thorn0]

Yes, regression. Output of 1.19.1:

// works as expected
.class {
  &:extend(.some-class
      .some-other-class
      .some-very-loooooooooooooong-class
      all);
}

// formatting once again adds an unwanted space after colon
.class {
  &:extend(.some-class
      .some-other-class
      .some-very-loooooooooooooong-class
      all);
}