Indentation inconsistent when using more than 1 line continuation

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• Make sure you are able to repro it on the latest released version
• Perform a quick search for existing issues to check if this bug has already been reported

Steps to reproduce

Execute the following script & compare the formatted output to the input (as defined by the variable $scriptDefinition)

$scriptDefinition = @'
$all_links = `
    [array](Get-ChildItem -Path ([Environment]::GetFolderPath('StartMenu')) -Recurse -Include '*.lnk') + `
    (Get-ChildItem -Path ([Environment]::GetFolderPath('CommonStartMenu')) -Recurse -Include '*.lnk')
'@

Invoke-Formatter -ScriptDefinition $scriptDefinition

Expected behavior

The output of the call to Invoke-Formatter should be the same as the input.

Actual behavior

The third line of the output is not indented to the same level as the second line - the output of Invoke-Formatter is as shown below.

$all_links = `
    [array](Get-ChildItem -Path ([Environment]::GetFolderPath('StartMenu')) -Recurse -Include '*.lnk') + `
(Get-ChildItem -Path ([Environment]::GetFolderPath('CommonStartMenu')) -Recurse -Include '*.lnk')

Environment data

> $PSVersionTable
Name                           Value
----                           -----
PSVersion                      5.1.18356.1
PSEdition                      Desktop
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}
BuildVersion                   10.0.18356.1
CLRVersion                     4.0.30319.42000
WSManStackVersion              3.0
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1
> (Get-Module -ListAvailable PSScriptAnalyzer).Version | ForEach-Object { $_.ToString() }
1.18.0

首先，使用 PSScriptAnalyzer 1.18.0 通过 Invoke-Formatter 运行提供的 PowerShell 脚本，并检查多个反引号续行的缩进方式。当第三行与第二行处于相同缩进级别，且格式化后的输出与输入一致时，即表示完成。