Ensure template files end with newline and add validation test

[Copilot]

Ensure template files end with newline and add validation test

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Fix template files missing trailing newlines

Description

GitHub tooling complains when files don't end with a newline. Fixed 375 template files across source code, CSS, configuration files, and localization files by adding trailing newlines.

Added NewlineEndingTest:

• Validates all template files end with newline (LF/0x0a)
• Mirrors existing ByteOrderMarkTest pattern
• Excludes third-party libraries (wwwroot/lib/*)

Fixed files:

• 4 source files: .fs, .razor
• 5 CSS files
• 17 configuration files: template.json, dotnetcli.host.json, ide.host.json, strings.json
• 349 localization files: templatestrings.*.json in .template.config/localize/*

Merge conflict resolution:

• Updated 13 RazorClassLibrary-CSharp localization files with latest translations from main branch while ensuring newline endings

Original prompt

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This section details on the original issue you should resolve

<issue_title>NIT: Returns in project template files</issue_title>
<issue_description>### Is there an existing issue for this?

• I have searched the existing issues

Describe the bug

NIT, so only if interested ......

GH complains about files not ending on a blank line (i.e., LF on the last code line). The BWA template has at least one example ...

https://github.com/dotnet/aspnetcore/blob/main/src/ProjectTemplates/Web.ProjectTemplates/content/BlazorWeb-CSharp/BlazorWebCSharp.1/Components/Pages/NotFound.razor

[Edit the file to witness it.]

Do you want to go through and confirm/update any files for this?

Expected Behavior

No response

Steps To Reproduce

No response

Exceptions (if any)

No response

.NET Version

No response

Anything else?

No response</issue_description>

<agent_instructions>Prepare a PR. Be sensible and avoid any file that shouldn't get this treatment, indicate so in your summary (which files you didn't change and the reason). We should also include a check similar to the one that we have for BOM on files.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

@ilonatommy @guardrex, just to clarify, are you suggesting here that we should always have a blank line in our template files? @javiercn @guardrex thanks for the clarification.

I think if this is the case, we would probably treat it similarly to the BOM and make sure that every file has the line ending and that we have tests that validate they get generated with it.

@guardrex any examples where GH is complaining? I imagine you mean copilot.</comment_new>
<comment_new>@javiercn
Hmm, not sure if this is a manual thing or if has been caused by .gitattributes.</comment_new>

• Fixes NIT: Returns in project template files #64752

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[Copilot]

Pull request overview

This PR addresses GitHub tooling complaints about files not ending with newlines by fixing 26 template files and adding a validation test to prevent future occurrences.

Key Changes:

• Added NewlineEndingTest that validates all template files end with a newline (LF/0x0a), mirroring the existing ByteOrderMarkTest pattern
• Fixed 26 template files across source code (.fs, .razor), CSS, and configuration files (template.json, dotnetcli.host.json, ide.host.json, strings.json)
• Excluded third-party libraries (wwwroot/lib/*) and auto-generated localization files (.template.config/localize/*) from validation

Reviewed changes

Copilot reviewed 1 out of 27 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/ProjectTemplates/test/Templates.Tests/NewlineEndingTest.cs	New test class that validates template files end with newline; checks multiple file types and excludes third-party/auto-generated content
src/ProjectTemplates/Web.ProjectTemplates/content/Worker-FSharp/Program.fs	Added trailing newline to F# source file
src/ProjectTemplates/Web.ProjectTemplates/content/WebApiAot-CSharp/.template.config/template.json	Added trailing newline to template configuration
src/ProjectTemplates/Web.ProjectTemplates/content/WebApiAot-CSharp/.template.config/ide.host.json	Added trailing newline to IDE host configuration
src/ProjectTemplates/Web.ProjectTemplates/content/WebApiAot-CSharp/.template.config/dotnetcli.host.json	Added trailing newline to dotnet CLI host configuration
src/ProjectTemplates/Web.ProjectTemplates/content/WebApi-CSharp/.template.config/zh-Hant/strings.json	Added trailing newline to Traditional Chinese localization strings
src/ProjectTemplates/Web.ProjectTemplates/content/WebApi-CSharp/.template.config/zh-Hans/strings.json	Added trailing newline to Simplified Chinese localization strings
src/ProjectTemplates/Web.ProjectTemplates/content/WebApi-CSharp/.template.config/tr/strings.json	Added trailing newline to Turkish localization strings
src/ProjectTemplates/Web.ProjectTemplates/content/WebApi-CSharp/.template.config/ru/strings.json	Added trailing newline to Russian localization strings
src/ProjectTemplates/Web.ProjectTemplates/content/WebApi-CSharp/.template.config/pt-BR/strings.json	Added trailing newline to Brazilian Portuguese localization strings
src/ProjectTemplates/Web.ProjectTemplates/content/WebApi-CSharp/.template.config/pl/strings.json	Added trailing newline to Polish localization strings
src/ProjectTemplates/Web.ProjectTemplates/content/WebApi-CSharp/.template.config/ko/strings.json	Added trailing newline to Korean localization strings
src/ProjectTemplates/Web.ProjectTemplates/content/WebApi-CSharp/.template.config/ja/strings.json	Added trailing newline to Japanese localization strings
src/ProjectTemplates/Web.ProjectTemplates/content/WebApi-CSharp/.template.config/it/strings.json	Added trailing newline to Italian localization strings
src/ProjectTemplates/Web.ProjectTemplates/content/WebApi-CSharp/.template.config/fr/strings.json	Added trailing newline to French localization strings
src/ProjectTemplates/Web.ProjectTemplates/content/WebApi-CSharp/.template.config/es/strings.json	Added trailing newline to Spanish localization strings
src/ProjectTemplates/Web.ProjectTemplates/content/WebApi-CSharp/.template.config/dotnetcli.host.json	Added trailing newline to dotnet CLI host configuration
src/ProjectTemplates/Web.ProjectTemplates/content/WebApi-CSharp/.template.config/de/strings.json	Added trailing newline to German localization strings
src/ProjectTemplates/Web.ProjectTemplates/content/WebApi-CSharp/.template.config/cs/strings.json	Added trailing newline to Czech localization strings
src/ProjectTemplates/Web.ProjectTemplates/content/StarterWeb-FSharp/wwwroot/css/site.css	Added trailing newline to F# starter web CSS file
src/ProjectTemplates/Web.ProjectTemplates/content/StarterWeb-CSharp/wwwroot/css/site.css	Added trailing newline to C# starter web CSS file
src/ProjectTemplates/Web.ProjectTemplates/content/RazorPagesWeb-CSharp/wwwroot/css/site.css	Added trailing newline to Razor Pages CSS file
src/ProjectTemplates/Web.ProjectTemplates/content/ComponentsWebAssembly-CSharp/wwwroot/css/app.css	Added trailing newline to WebAssembly app CSS file
src/ProjectTemplates/Web.ProjectTemplates/content/ComponentsWebAssembly-CSharp/Pages/NotFound.razor	Added trailing newline to WebAssembly NotFound page
src/ProjectTemplates/Web.ProjectTemplates/content/BlazorWeb-CSharp/BlazorWebCSharp.1/wwwroot/app.css	Added trailing newline to Blazor Web app CSS file
src/ProjectTemplates/Web.ProjectTemplates/content/BlazorWeb-CSharp/BlazorWebCSharp.1/Components/Pages/NotFound.razor	Added trailing newline to Blazor NotFound page
src/ProjectTemplates/Web.ProjectTemplates/content/BlazorWeb-CSharp/BlazorWebCSharp.1.Client/_Imports.razor	Added trailing newline to Blazor client imports file

[javiercn]

@copilot fix the merge conflicts

[Copilot]

@copilot fix the merge conflicts

Fixed merge conflicts by updating 13 RazorClassLibrary-CSharp localization files with the latest translations from main and ensuring they all end with newlines. Changes committed in fb131bb.

[Ma202010]