System.Uri: Updated logic for combining base and URL

[frobijn]

Description

• Updated implementation of Uri (Uri baseUri, string relativeUrl).
• Updated corresponding unit tests.
• Added .editorconfig.
• Unintended reformatting of the Uri (string, UriKind) and IsWellFormedUriString methods, probably because of tab/space conversion due to .editorconfig rules.

Motivation and Context

The previous implementation was based on conventions that are different from the regular rules for combining a base URL with a relative URL in browsers, as also implemented in the full .NET System.Uri. In particular (evaluated in C# interactive):

new Uri (new Uri ("http://localhost/Home/Sub"), "Other/Url").AbsoluteUri
    "http://localhost/Home/Other/Url" (old implementation: incorrect "http://localhost/Home/Sub/Other/Url")
 
new Uri (new Uri ("http://localhost/Home/Sub/"), "Other/Url").AbsoluteUri
    "http://localhost/Home/Sub/Other/Url" (old implementation: correct)

new Uri (new Uri ("http://localhost/Home/Sub.html?id=3"), "/Other/Page.html?code=x").AbsoluteUri
    "http://localhost/Other/Page.html?code=x" (old implementation: incorrect "http://localhost/Home/Sub.html?id=3/Other/Page.html?code=x")
     
new Uri (new Uri ("http://localhost/Home/Sub"), "/Other/Url").AbsoluteUri
    "http://localhost/Other/Url" (old implementation: incorrect "http://localhost/Home/Sub/Other/Url")

new Uri (new Uri ("http://localhost/Home/Sub"), "http://other/Other/Url").AbsoluteUri
    "http://other/Other/Url" (old implementation: not tested but incorrect)

How Has This Been Tested?

Updated unit tests.

Types of changes

• Improvement (non-breaking change that improves a feature, code or algorithm)
• Bug fix (non-breaking change which fixes an issue with code or algorithm)
• New feature (non-breaking change which adds functionality to code)
• Breaking change (fix or feature that would cause existing functionality to change)
• Config and build (change in the configuration and build system, has no impact on code or features)
• Dependencies (update dependencies and changes associated, has no impact on code or features)
• Unit Tests (add new Unit Test(s) or improved existing one(s), has no impact on code or features)
• Documentation (changes or updates in the documentation, has no impact on code or features)

Checklist:

• My code follows the code style of this project (only if there are changes in source code).
• My changes require an update to the documentation (there are changes that require the docs website to be updated).
• I have updated the documentation accordingly (the changes require an update on the docs in this repo).
• I have read the CONTRIBUTING document.
• I have tested everything locally and all new and existing tests passed (only if there are changes in source code).
• I have added new tests to cover my changes.

[coderabbitai]

Important

Review skipped

Review was skipped due to path filters

⛔ Files ignored due to path filters (4)

• .editorconfig is excluded by none and included by none
• Tests/HttpUnitTests/UriUnitTests.cs is excluded by none and included by none
• nanoFramework.System.Net.Http/Http/System.Uri.cs is excluded by none and included by none
• spelling_exclusion.dic is excluded by none and included by none

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[frobijn]

From the git history it seems that the old implementation was added by @Ellerbach. Ping because I presume the code was added to enable functionality in other applications. Those other applications may require an update if they rely on the old combination rules.

[Ellerbach]

OK, I see, that corrects more elements and correct some bugs I4ve been introducing correcting the previous bug. So all good as it's the proper behavior.

[Ellerbach]

Thanks for fixing the additional bugs. Seems that this time it's all god!

[Ellerbach]

azp /run