From 9c63714e80e0a72d63431997306c11765e36d1bf Mon Sep 17 00:00:00 2001
From: Damien Elmes <git@ichi2.net>
Date: Mon, 7 Aug 2017 15:15:31 +1000
Subject: [PATCH] delay setHtml() until previous page has fully loaded

based on https://github.com/dae/anki/pull/194/commits/0241eb70dc203b1aadc300c6895f52ab2d44d951
---
 aqt/webview.py | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/aqt/webview.py b/aqt/webview.py
index 4f1d3c814..0bd3a2b34 100644
--- a/aqt/webview.py
+++ b/aqt/webview.py
@@ -76,6 +76,7 @@ class AnkiWebView(QWebEngineView):
         self._page = AnkiWebPage(self._onBridgeCmd)
 
         self._domDone = True
+        self._pendingJS = []
         self.setPage(self._page)
 
         self._page.profile().setHttpCacheType(QWebEngineProfile.NoCache)
@@ -139,11 +140,12 @@ class AnkiWebView(QWebEngineView):
         pass
 
     def setHtml(self, html):
-        if not self._domDone:
+        if not self._domDone or self._pendingJS:
+            # defer update until previous page has initialized
             if devMode:
-                import traceback
-                print("ignoring setHtml() called before DOM ready")
-                print("caller was", traceback.format_stack()[-3])
+                print("deferring setHtml() until page is ready")
+            from aqt import mw
+            mw.progress.timer(25, lambda: self.setHtml(html), False)
             return
         app = QApplication.instance()
         oldFocus = app.focusWidget()