Add support for the OS 26 SDKs

Author: mattmassicotte

.github/workflows/ci.yml

@@ -23,16 +23,16 @@ jobs:
     runs-on: macOS-15
     timeout-minutes: 30
     env:
-      DEVELOPER_DIR: /Applications/Xcode_16.3.app
+      DEVELOPER_DIR: /Applications/Xcode_26.0.app
     strategy:
       matrix:
         destination:
           - "platform=macOS"
           - "platform=macOS,variant=Mac Catalyst"
-          - "platform=iOS Simulator,name=iPhone 16"
-          - "platform=tvOS Simulator,name=Apple TV"
-          - "platform=watchOS Simulator,name=Apple Watch Series 10 (42mm)"
-          - "platform=visionOS Simulator,name=Apple Vision Pro"
+          - "platform=iOS Simulator,name=iPhone 16e"
+          - "platform=tvOS Simulator,name=Apple TV,OS=26.0"
+          - "platform=watchOS Simulator,name=Apple Watch Series 11 (42mm),OS=26.0"
+          - "platform=visionOS Simulator,name=Apple Vision Pro,OS=26.0"
     steps:
       - uses: actions/checkout@v4
       - name: Test platform ${{ matrix.destination }}
@@ -42,17 +42,12 @@ jobs:
     name: Test Linux
     runs-on: ubuntu-latest
     timeout-minutes: 30
-    strategy:
-      matrix:
-        swift-version:
-          - 6.0.3
-          - 6.1
     steps:
       - name: Checkout
         uses: actions/checkout@v4
       - name: Swiftly
         uses: vapor/swiftly-action@v0.2.0
         with:
-          toolchain: ${{ matrix.swift-version }}
+          toolchain: latest
       - name: Test
         run: swift test

Sources/TextFormation/MutableStringPartialSystem.swift

@@ -41,6 +41,7 @@ extension MutableStringPartialSystem {
 		content.attributedSubstring(from: range).string
 	}
 
+	@preconcurrency @MainActor
 	public func applyMutation(in range: NSRange, string: String, undoManager: UndoManager? = nil) -> MutationOutput<NSRange> {
 		let nsAttrString = NSAttributedString(string: string)
 		let length = nsAttrString.length