fix(duckplayer): prevent new tab creation on target=_blank links

DuckDuckGo/Tab/TabExtensions/DuckPlayerTabExtension.swift

@@ -131,6 +131,17 @@ extension DuckPlayerTabExtension: YoutubeOverlayUserScriptDelegate {
 extension DuckPlayerTabExtension: NewWindowPolicyDecisionMaker {
 
     func decideNewWindowPolicy(for navigationAction: WKNavigationAction) -> NavigationDecision? {
+        // if a link was clicked inside duckplayer (like a recommendation)
+        // and has target=_blank - then we want to prevent a new tab
+        // opening, and just load it inside the current one instead
+        if navigationAction.targetFrame == nil,
+           navigationAction.safeSourceFrame?.webView?.url?.isDuckPlayer == true,
+           navigationAction.request.url?.isYoutubeVideoRecommendation == true,
+           let webView, let url = navigationAction.request.url {
+            webView.load(URLRequest(url: url))
+            return .cancel
+        }
+
         if let shouldSelectNextNewTab {
             defer {
                 self.shouldSelectNextNewTab = nil