Focus the page view's web view when it opens

mac/Sources/Byre/Pages.swift

@@ -643,6 +643,7 @@ private struct WebPage {
 
     final class Coordinator {
         var reloads = 0
+        var shown = false
     }
 
     func makeCoordinator() -> Coordinator {
@@ -659,11 +660,23 @@ private struct WebPage {
 
     private func update(_ view: WKWebView, _ c: Coordinator) {
         view.isHidden = !shown
+        if shown, !c.shown {
+            focus(view)
+        }
+        c.shown = shown
         if c.reloads != reloads {
             c.reloads = reloads
             view.reload()
         }
     }
+
+    private func focus(_ view: WKWebView) {
+        #if os(macOS)
+        DispatchQueue.main.async {
+            unsafe view.window?.makeFirstResponder(view)
+        }
+        #endif
+    }
 }
 
 #if os(macOS)