@unixzii found that the bug is because when inputing Chinese, SourceEditorContentView are triggering setNeedsLayout during its view layout life cycle. And he came up with a patch for it. Hook the layoutSublayers implementation and add a timer to it. If it was called more than 100 times in 0.1 second, ignore the rest of call temporary. See patch and workaround here. https://github.com/unixzii/XcodePatch

Current we could workaround by using a custom define in Package.swift swiftSettings: [.define("SWIFT_PACKAGE")])

Don't need to reinstall of macOS and Xcode. A solution for me PATH=/System/Library/Frameworks/CoreServices.framework/Frameworks/LaunchServices.framework/Support:"$PATH" lsregister -f /Applications/Safari.app

A solution for me PATH=/System/Library/Frameworks/CoreServices.framework/Frameworks/LaunchServices.framework/Support:"$PATH" lsregister -f /Applications/Safari.app