Issue 1413
This happens when the networkmanager is used by something that has no
tab_id, like the generic DownloadManager. In this case, we should just
skip the webview connection (as it makes no sense) instead of crashing
(which is the last thing we want to do).
When a download is finished with `removed-finished-download` set to a
delay, it's removed via a singleshot QTimer.
However, when the window was closed in the meantime, the slot still was
executed by Qt, even though the DownloadManager was already deleted.
Fixes#1242
Issue #1214
Now uses a sensible filename for data: links instead of the whole base64
content. For PDF.js, it even uses the correct pdf filename.
TODO: Produces "QPainter:🔚 Painter ended with 2 saved states" while
running the tests here (Arch Linux):
CPython: 3.5.1
Qt: 5.5.1, runtime: 5.5.1
PyQt: 5.5.1
