PR Summary

Fixes #1311 by refining the logic to determine if a pipeline spans one line or not. Previously it compared only the StartLineNumber of the first and last pipeline to be equal. Now the logic needs to be tweaked with an OR condition where also the EndLineNumber of the first and last pipeline is checked for equality.
Code was also made more readable.

PR Checklist

• PR has a meaningful title
  • Use the present tense and imperative mood when describing your changes
• Summarized changes
• Change is not breaking
• Make sure all .cs, .ps1 and .psm1 files have the correct copyright header
• Make sure you've added a new test if existing tests do not effectively test the code changed and/or updated documentation
• This PR is ready to merge and is not Work in Progress.
  • If the PR is work in progress, please add the prefix WIP: to the beginning of the title and remove the prefix when the PR is ready.