Exclude globs that look like **\subdir\** do not exclude files without extensions

[ladipro]

Issue Description

A regression introduced in #6151.
Reported by @ForNeVeR in dotnet/sdk#17976.

Steps to Reproduce

Use an exclude glob that looks like **\subdir\** and have a file without extension under a subdir subdirectory.

Example:

<Project>
  <ItemGroup>
    <Test Include="dir\**" Exclude="**\subdir\**" />
  </ItemGroup>

  <Target Name="Build">
    <Message Text="@(Test, ', ')" />
  </Target>
</Project>

With a file structure as follows:

│   expand.proj
│
└───dir
    └───subdir
            file1.ext
            file2

Expected Behavior

Does not print anything. All included Test items are immediately excluded.

Actual Behavior

Prints dir\subdir\file2.

Analysis

This is another issue with taking *.* too literally. In this case the default filespec is added when parsing **\subdir\** which is understood as **\subdir\**\*.* and files are matched against the actual . dot.

Versions & Configurations

Introduced in 16.10.

[ForNeVeR]

For future visitors, see dotnet/sdk#17976 (comment) for a possible workaround.

[ahmedalejo]

@ladipro this issue seems to be back again.
With the following folder structure

│  API.csproj
│
└──wwwroot
    └──.well-known
           apple-app-site-association

All except the .well-known isn´t include when published.
It also shows as hidden in vs explorer as well.
It looks like it is now not being added by default.

I will try adding back
<Content Include="wwwroot\.well-known\**" />
I removed this initially due to this bug (i.e. #17976)

MSBUILD

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]

@ahmedalejo thank you for reporting this. The new behavior is actually by design and what you're seeing with 16.10.1+2fd48ab73 was a bug. Apologies for the inconvenience. I've left a comment in #6708.