Resize image attachments to fit the view

Sources/AttributedText/AttributedText_AppKit.swift

@@ -77,7 +77,9 @@
 
         override func layout() {
             super.layout()
+
             textView.frame = bounds
+            textView.attributedString().updateImageTextAttachments(maxWidth: bounds.width)
         }
 
         override func invalidateIntrinsicContentSize() {

Sources/AttributedText/AttributedText_UIKit.swift

@@ -69,7 +69,9 @@
 
         override func layoutSubviews() {
             super.layoutSubviews()
+
             textView.frame = bounds
+            textView.attributedText.updateImageTextAttachments(maxWidth: bounds.width)
         }
 
         override func invalidateIntrinsicContentSize() {

Sources/AttributedText/NSAttributedString+TextAttachment.swift

@@ -0,0 +1,20 @@
+#if os(macOS)
+    import AppKit
+#elseif canImport(UIKit)
+    import UIKit
+#endif
+
+extension NSAttributedString {
+    func updateImageTextAttachments(maxWidth: CGFloat) {
+        enumerateAttribute(.attachment, in: NSRange(location: 0, length: length), options: []) { value, _, _ in
+            guard let attachment = value as? NSTextAttachment,
+                  let image = attachment.image else { return }
+
+            let aspectRatio = image.size.width / image.size.height
+            let width = min(maxWidth, image.size.width)
+            let height = width / aspectRatio
+
+            attachment.bounds = CGRect(x: 0, y: 0, width: width, height: height)
+        }
+    }
+}