Include globs that look like \subdir** do not include files without extensions

[ahmedalejo]

Issue Description

A regression introduced in Microsoft (R) Build Engine version 16.10.2+857e5a733 for .NET.
Related to @ForNeVeR in dotnet/sdk#17976. and @ladipro in #6502

Steps to Reproduce

Add a .well-known\apple-app-site-association file to the wwwroot folder of an aspnetcore project. Then run dotnet publish.

Expected Behavior

• The .well-known\apple-app-site-association file should be published to the wwwroot folder.

Actual Behavior

• The .well-known\apple-app-site-association file is not published to the wwwroot folder.

Analysis

This seems to be related to files without an extension like apple-app-site-association rendering the .weel-known folder to be considered empty and therefore not published.
This worked previously with Microsoft (R) Build Engine version 16.10.1+2fd48ab73.

Works when the following is added

<Content Include="wwwroot\.well-known\**" CopyToPublishDirectory="Always" />

but not

<Content Include="wwwroot\.well-known\**" />

Note that none of the above was required in the previous version (Microsoft (R) Build Engine version 16.10.1+2fd48ab73)

Versions & Configurations

on Azure DevOps agent.

• ✔Microsoft (R) Build Engine version 16.10.1+2fd48ab73 for .NET publish includes wwwroot/.well-known folder
• ❌Microsoft (R) Build Engine version 16.10.2+857e5a733 for .NET publish does not includes wwwroot/.well-known folder

[ladipro]

The previous behavior where the file was included in Content was unfortunately a bug. Content by default excludes everything from directories with a leading . (dot). Directories with such names are considered internal / hidden, take .git as an example.

#6531 is the fix that got us back to the correct behavior.

[benvillalobos]

Team Triage: Closing this out since there is a fix out. Feel free to comment & reopen if, after updating, you're still seeing the issue.