fix(visionOS): make the package actually build for visionOS

Package.swift

@@ -8,7 +8,7 @@ let package = Package(
   platforms: [
     .iOS(.v15),
     .macOS(.v12),
-    .visionOS(.v1)
+    .visionOS(.v2)
   ],
   products: [
     .library(

Sources/LaTeXSwiftUI/Extensions/Image+Extensions.swift

@@ -26,25 +26,15 @@ import SwiftUI
 
 internal extension Image {
 
-  init(image: _Image, scale: CGFloat = 1.0) {
+  init(image: _Image) {
 #if os(iOS) || os(visionOS)
+    // `UIImage(cgImage:scale:orientation:)` already carries the display
+    // scale, so its `size` is in points.
     self.init(uiImage: image)
 #else
-    if scale > 1.0 {
-      let scaledSize = NSSize(
-          width: image.size.width / scale,
-          height: image.size.height / scale
-      )
-
-      let scaledImage = image.resized(to: scaledSize)
-      if let representation = image.representations.first {
-        scaledImage.addRepresentation(representation)
-      }
-
-      self.init(nsImage: scaledImage)
-      return
-    }
-
+    // `NSImage(cgImage:size:)` is created with the logical size, so its
+    // `size` is already in points — dividing by the display scale again
+    // would lay the image out at half its intended size on Retina screens.
     self.init(nsImage: image)
 #endif
   }

Sources/LaTeXSwiftUI/Extensions/TeXInputProcessorOptions+Extensions.swift

@@ -37,7 +37,16 @@ extension TeXInputProcessorOptions {
   convenience init(processEscapes: Bool, errorMode: LaTeX.ErrorMode) {
     self.init()
     self.processEscapes = processEscapes
-
+
+    // MathJaxSwift 3.5.0 ships `defaultDigits` with its escapes stripped
+    // (`\{,\}` → `{,}`, `\.` → `.`), so the unescaped `.` matches *any*
+    // character and the tokenizer swallows whatever follows a number: `x^{2}`
+    // loses its closing brace and MathJax fails with "Extra open brace or
+    // missing close brace". Restore MathJax's own default regex.
+    // See colinc86/MathJaxSwift#45.
+    digits = #"^(?:[0-9]+(?:\{,\}[0-9]{3})*(?:\.[0-9]*)?|\.[0-9]+)"#
+
+
     var packages = TeXInputProcessorOptions.Packages.all
     if errorMode != .rendered {
       if let noErrorsIndex = packages.firstIndex(of: TeXInputProcessorOptions.Packages.noerrors) {

Sources/LaTeXSwiftUI/Models/Renderer.swift

@@ -515,7 +515,7 @@ extension Renderer {
     Cache.shared.setImageCacheValue(image, for: cacheKey)
 
     // Finish up
-    return Image(image: image, scale: displayScale)
+    return Image(image: image)
       .renderingMode(renderingMode)
       .antialiased(true)
       .interpolation(.high)

Sources/LaTeXSwiftUI/Previews/LaTeX_Previews+Fonts.swift

@@ -25,7 +25,7 @@
 
 import SwiftUI
 
-#if os(iOS)
+#if os(iOS) || os(visionOS)
 import UIKit
 typealias PlatformFont = UIFont
 #else