color icon cursor

mac/Sources/Byre/MarkdownView.swift

@@ -476,6 +476,25 @@ private final class FlowTextView: NSTextView {
         return super.resignFirstResponder()
     }
 
+    override func cursorUpdate(with event: NSEvent) {
+        guard frontmost(event) else {
+            NSCursor.arrow.set()
+            return
+        }
+        super.cursorUpdate(with: event)
+    }
+
+    override func mouseMoved(with event: NSEvent) {
+        guard frontmost(event) else {
+            return
+        }
+        super.mouseMoved(with: event)
+    }
+
+    private func frontmost(_ event: NSEvent) -> Bool {
+        unsafe window?.contentView?.hitTest(event.locationInWindow)?.isDescendant(of: self) == true
+    }
+
     override func mouseDown(with event: NSEvent) {
         let onLink = link(at: convert(event.locationInWindow, from: nil))
         super.mouseDown(with: event)