browserWindowSetParentWindow: Support null parameter

Author: softworkz

src/ElectronNET.API/API/BrowserWindow.cs

@@ -1123,7 +1123,17 @@ public Task<bool> SetThumbarButtonsAsync(ThumbarButton[] thumbarButtons)
     /// passing null will turn current window into a top-level window.
     /// </summary>
     /// <param name="parent"></param>
-    public void SetParentWindow(BrowserWindow parent) => this.CallMethod1(JObject.FromObject(parent, _jsonSerializer));
+    public void SetParentWindow(BrowserWindow parent)
+    {
+        if (parent == null)
+        {
+            BridgeConnector.Socket.Emit("browserWindowSetParentWindow", Id, null);
+        }
+        else
+        {
+            BridgeConnector.Socket.Emit("browserWindowSetParentWindow", Id, JObject.FromObject(parent, _jsonSerializer));
+        }
+    }
 
     /// <summary>
     /// The parent window.

src/ElectronNET.Host/api/browserWindows.ts

@@ -721,9 +721,14 @@ export = (socket: Socket, app: Electron.App) => {
     });
 
     socket.on('browserWindowSetParentWindow', (id, parent) => {
+        const child = getWindowById(id);
+        if (!parent) {
+            // Clear parent: make this window top-level
+            child.setParentWindow(null);
+            return;
+        }
         const browserWindow = BrowserWindow.fromId(parent.id);
-
-        getWindowById(id).setParentWindow(browserWindow);
+        child.setParentWindow(browserWindow);
     });
 
     socket.on('browserWindowGetParentWindow', (id) => {