Indent according to operators precedence

[uk-ar]

Indents after operators should respect their precedence.

• expected result:
• 1+2+(5*3)

1 +
  2 + 5 *
      3

• 1+(2*5)+3

1 +
  2 * 5 +
  3

[ap4y]

This is a really awesome feature! Thanks a lot @uk-ar.