Gets a list of line ranges (index and length if more than 1) for files changed since diverging from origin master

GetNewAndEditedLineRangesFromMaster.ps1

function Get-LinesChanged() {
	$diffFromCommonBase = git diff origin/master...HEAD --unified=0 --dst-prefix=""
		
	$linesByFile = @{}
	$currentLines = New-Object System.Collections.ArrayList
	foreach ($diffLine in $diffFromCommonBase ) {
		if ($diffLine.StartsWith("+++")) {
			#e.g. "+++ Path/to/file.cs" -> "Path/to/file.cs"
			$currentFile = $diffLine.Substring(4)
			$currentLines = $linesByFile[$currentFile] = New-Object System.Collections.ArrayList
		}
		if ($diffLine.StartsWith("@@")) {
			# e.g. "@@ -38 +39,16 @@..." -> "+39,16", the index and length in the new file
			$newIndexAndLength = $diffLine.Split(" ")[2].Substring(1)
			$null = $currentLines.Add($newIndexAndLength)
		}
	}
	
	return $linesByFile
}