Fix custom dialog example

Fix issue where  ERR_UNEXPECTED_PROXY_AUTH error page is shown
on proxy dialog request.

* use qt.io url as dummy, otherwise CONNECT and GET
requests to localhost end in proxy unexpected error.
* in case of invalid authentication reload url instead of showing
error page.
* adjust app default width and height so dialog box is visible.

Pick-to: 6.2
Change-Id: I16a1dade73f7cb0f4f6da48b7d6902a2e7a57b5b
Reviewed-by: Michael Brüning <michael.bruning@qt.io>

1 files changed, 5 insertions, 3 deletions

diff --git a/examples/webengine/customdialogs/WebView.qml b/examples/webengine/customdialogs/WebView.qml
index 5d388e467..61bbea87e 100644
--- a/examples/webengine/customdialogs/WebView.qml
+++ b/examples/webengine/customdialogs/WebView.qml
@@ -52,7 +52,7 @@ import QtQuick
 import QtWebEngine
 
 WebEngineView {
-
+    id: view
     url: "qrc:/index.html"
     property bool useDefaultDialogs: true
     signal openForm(var form)
@@ -115,9 +115,11 @@ WebEngineView {
     }
 
     onAuthenticationDialogRequested: function(request) {
-        if (useDefaultDialogs)
+        if (useDefaultDialogs) {
+            // do not show proxy error page
+            view.url = "qrc:/index.html"
             return;
-
+        }
         request.accepted = true;
         openForm({item: Qt.resolvedUrl("forms/Authentication.qml"),
                      properties: {"request": request}});