[6.0] Implement `fileAffectsSwiftOrClangBuildSettings` with the logic from `LLBuildManifestBuilder`

ahoppen commented 3 months ago

Explanation: Instead of inspecting file extensions to decide whether a file might affect build settings, check which files are in directories that are affecting compilation. This is the same logic that LLBuildManifestBuilder uses and should be more stable. In particular, this stops us from reloading the package manifest in SourceKit-LSP when a header file is written to a .build directory.
Scope: Only affects SourceKit-LSP
Risk: Low, only affects SourceKit-LSP
Testing: Adding a SourceKit-LSP test case in https://github.com/swiftlang/sourcekit-lsp/pull/1512
Issue: rdar://128573306
Reviewer: @MaxDesiatov @xedin on https://github.com/swiftlang/swift-package-manager/pull/7699

ahoppen commented 3 months ago

@swift-ci Please test

ahoppen commented 3 months ago

@swift-ci Please test

swiftlang / swift-package-manager