WebviewWidget: WebEngine don't grab focus on setHtml

If running on WebEngine the call to setHtml grabs focus and sets it to WebViewWidget. Prevent such behaviour.

Author: nikicc

Orange/widgets/utils/webview.py

@@ -518,3 +518,14 @@ def html(self):
         def exposeObject(self, name, obj):
             obj = _to_primitive_types(obj)
             self._jsobject_channel.send_object(name, obj)
+
+        def setHtml(self, html, base_url=''):
+            # WebViewWidget grabs focus on setHTML which can be quite annoying.
+            # For example, if you have a line edit as filter and show results
+            # in WebWiew, then WebView grabs focus after every typed character.
+            #
+            # MORE: http://stackoverflow.com/questions/36609489/how-to-prevent-qwebengineview-to-grab-focus-on-sethtml-and-load-calls
+            initial_state = self.isEnabled()
+            self.setEnabled(False)
+            super().setHtml(html, base_url)
+            self.setEnabled(initial_state)