Prevent exception in binary-expression-wrapping rule

[paul-dingemans]

Description

Prevent exception in binary-expression-wrapping rule in case it is preceded on the same line by a block comment containing a newline character

Function leavesOnLine calls function getFirstLeafOnLineOrSelf which finds the first leaf on the line by looking for newline character. A block comment containing a newline character resulted in considering that block comment to be the first element on the line, even in case it was preceded by other elements on the same line.

Due to this change, the max-line-length rule failed, which has been resolved by refactoring the calculation of the line length.

Closes #2601

Checklist

Before submitting the PR, please check following (checks which are not relevant may be ignored):

• Commit message are well written. In addition to a short title, the commit message also explain why a change is made.
• At least one commit message contains a reference Closes #<xxx> or Fixes #<xxx> (replace<xxx> with issue number)
• Tests are added
• KtLint format has been applied on source code itself and violations are fixed
• PR title is short and clear (it is used as description in the release changelog)
• PR description added (background information)

Documentation is updated. See difference between snapshot and release documentation

• Snapshot documentation in case documentation is to be released together with a code change
• Release documentation in case documentation is related to a released version of ktlint and has to be published as soon as the change is merged to master